Quality custom Casio watches
F-91WB "Panda"
A158 "Vintro"
A100WE "Agent"
Hey, welcome to FortMod
I'm Eric, and I've been modding Casio watches since early 2023. In June of 2023, I came up with the idea to start selling my custom watches because of one key issue:
Unlike traditional round watches, most Casio watches hide their lugs under the case. This creates a "lugless" look where the strap blends right into the case.For this to work, the lugs on most Casios are narrower than the case itself. This however means that the strap fitted between these lugs would also be narrower than the case.This is why Casio adds cut-outs or "notches" to their straps, which allow the wider strap to fit into the narrower lugs. For example, the F-91W ships with a 22mm strap to match the 22mm width of the case, despite the lugs themselves being 18mm in width.
But what if you want to swap out the strap on your Casio for your own?
You get the image above.Due to the 18mm lugs of the watch, you're stuck with fitting 18mm straps to the otherwise 22mm wide watch case, with the end result looking quite awkward.
The solution
Most people will simply opt for a standard 18mm strap to fit easily to the 18mm lugs of their Casio, while others will use adapters to fit wider straps to the watch. I wasn't satisfied with either of these options, so I began using the same method that Casio does to create its seamless strap look by notching not only leather straps, but nylon NATOs too.I figured that the same way nylon straps are heat sealed during their manufacturing process, that same way I could melt the material before and after notching them to ensure the material doesn't fray. This allows me to make the trademark custom Casio + NATO watch, with the improved aesthetics that come with the strap now blending perfectly with the rest of the watch.
The result
© FortMod 2025 - All rights reserved
© FortMod 2025 - All rights reserved
F-91W(B)
Panda
Playful - yet utterly practical.
What if Casio started making watches 20 years earlier?
Casio has history and reliability. Now, let's give it class.
BLACKSILVER
The FortMod debut.
"What if Casio started making watches 20 years earlier?"
The A158 "VINTRO" (Vintage-Retro) harkens back to the classic, earthy hues of vintage 1950s watches, combined with the retro appeal of the iconic A158. The watch is set with a brown, 20mm genuine leather strap hand-notched by myself. The beige dial contrasts with an inverted display with yellow characters.
This watch also features an optional LED modification - the upgraded LED glows amber and is considerably brighter than the original with little effect on battery. The LED mod is a separate option as it requires some careful soldering work done to the internals of the watch.
© FortMod 2025 - All rights reserved
"Casio has history and reliability. Now, let's give it class."
With its reserved, monochrome colour scheme, and its multiple surfaces, I immediately saw the potential in this model for a refined look. The watch has been fitted with a hand-notched, 20mm black leather crocodile style strap to bring out the sense of depth in the watch face. To complete this cohesive, covert look, the display has been inverted to blend with the rest of the black display.
© FortMod 2025 - All rights reserved
F-91W(B)
Panda
Playful - yet utterly practical.Borne out of a love for monochrome colour palettes and panda-dial chronographs, the "Panda" adds a pop of contrast to the white model of the F-91WB - featuring an inverted display, black resin strap, and optional NFC and backlight upgrades.
F-91W(B) Panda on a ~6.25'' wrist
Do you refuse to buy gear that falls anywhere on the colour spectrum outside of greyscale? So do I!In which case, the F-91W(B) Panda will fit comfortably with all your monochrome gadgets and accessories.
The brushed steel caseback, in all its glory.All gaskets inside custom Casios are re-greased during reassembly to ensure original water resistance.
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F - 9 1 W
BLACKSILVER
DESCRIPTION
The "Blacksilver" - a tasteful monochrome mod for the iconic Casio F-91W, and the first custom model to be showcased on FortMod. This piece features a hand-notched, 22mm NATO strap for a perfect even fit, as well as an inverted display to match its black watchface.The F-91W Blacksilver comes with 2 extra, optional mods - a 144 byte NFC chip, and an upgraded, brighter LED backlight that glows amber. More info on store page below.
© FortMod 2025 - All rights reserved
ABOUT
FortMod (FtMod) is a passion project started in June 2023 by Eric Thurn, making, showcasing, and selling high quality hand-modded custom Casio watches.FortMod stands out by making full-width, notched straps a standard in all custom watches on offer, as well as offering custom orders for those looking for something they just can't find anywhere else.All watches are modified by hand with great attention to detail, being thoroughly tested before and after the process is complete. Modifications include custom LCD colours, hand-notched custom straps, NFC chip installs, display and/or module swaps, custom lettering and repaints.
RATED 5 STARS
FortMod is a "star seller" on Etsy, consistently receiving 5 star reviews:
Munsonman
14 Nov, 2024
A100WE "Agent"
"Agent is a very appropriate name for this modern watch. With the black leather strap, the glossy black detail on the face, and the polarized screen, it really gives off a classy vibe. It's a nice 80's retro-styled dressy watch. The seller was responsive when I had a question and did a good job keeping me informed on the status of my purchase. It was a good experience overall, and I'm very happy with my purchase."
PURCHASES / TRANSACTIONS
All on-site transactions and data are securely processed by PayPal. A PayPal account is not necessary for checkout, but can be used if you have one.
ITEM CONDITION / WARRANTY
- All items sold by FortMod are new, have never been used, and come with the original papers.- All items are fully tested prior to shipping - this includes functions, LCD display, sound and LED light.- I do not offer long-term warranty. However, I offer a 14 day return/exchange period in case any fault crops up within that time. See below section for details.- The modifications I perform usually involve opening the watch and modifying internal components, so Casio warranty is void.
RETURNS POLICY
I accept returns/exchanges within a 14 day time window in case of faults, in which case you will receive a full refund for the amount you purchased the item for, or the exchange item of your choosing plus or minus any price differences.A faulty product is defined as: where one or more of the aspects of the item received do not match the description, either functionally or cosmetically.If this applies to you, reach out to me at the address below.
CONTACT
For any enquiries, custom orders, returns, feel free to contact me via email at: [email protected].
© FortMod 2025 - All rights reserved
How to program your NFC-enabled watch:
Eric Thurn
A little about me:
I'm a marketing student, hobbyist photographer, and watch modder based in Exeter, England.I got my first Casio watch, the W-86, when I was a teenager in secondary school. Although it was very simple, I loved the functional, retro design. I didn't care much for watches at the time, but this unassuming timepiece was ultimately what sparked my later interest in horology.I've also always been a tinkerer, restoring old laptops and modding android devices since my teenage years.Today I am a major watch enthusiast. I particularly love vintage-style chronographs and field watches. But my respect and appreciation for the simplicity, efficiency and unique look of Casio's digital watches has never dwindled - only grown.It is no wonder then, that my history with Casio watches, combined with my background in technology and design has led me to this hobby of mine; watch modding, and the resulting creation of FortMod.
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