Casio Pro Trek PRW-3500 (→ PRG-340)
Published · Researched 2026-09-21
2026 lineup note — substitution recorded: The requested PRW-3500 is discontinued — Gear Patrol reported in 2026 that it has disappeared from Casio's current catalog, though a legacy official page still shows $365. It remains available used/vintage-new. The current, community-popular same-department model is the PRG-340 (the modern Tough Solar / Triple Sensor Pro Trek, in this catalog at
/library/gear/navigation-safety/casio-pro-trek-prg-340/). This dossier documents the PRW-3500 (requested model): ~90 g / 3.17 oz; Tough Solar; Multi-Band 6; Triple Sensor v3; 200 m WR; −10°C rated. Fit trap: the 53.4 mm case is huge — small wrists need not apply.
Version lineage (2023–2026)
- Pre-2023: PRW-3500 — the big readable Pro Trek: Triple Sensor Version 3 (compass/altimeter/barometer/thermometer), Tough Solar, Multi-Band 6 atomic timekeeping, 200 m water resistance, $365 list.
- 2023–2025: Fades from the current catalog; replaced in spirit by the PRG-340/PRG-340T line.
- 2026: Gear Patrol confirms the discontinuation; legacy page persists. Used market is now the source.
Overview
The PRW-3500 was the Pro Trek for people who wanted maximum readability and maximum sensor: a huge high-contrast digital display, the v3 Triple Sensor (direction, altitude, barometric pressure, temperature), solar charging so you never open it for a battery, and Multi-Band 6 radio time sync. At ~90 g it's light for its size, but the 53.4 mm case dominates small wrists — the single biggest reason buyers bounced off it. Enthusiasts still value the readable display, the sensor suite, and the −10°C low-temp rating. It's not a smartwatch and doesn't pretend to be: no GPS, no notifications, no subscription — just ABC data on your wrist for a decade.
Key Specs (PRW-3500)
| Spec | Value |
|---|---|
| Sensors | Triple Sensor v3: compass, altimeter, barometer, thermometer |
| Power | Tough Solar (solar rechargeable) |
| Time sync | Multi-Band 6 (atomic radio) |
| Water resistance | 200 m |
| Low-temp rating | −10°C / 14°F |
| Case | 53.4 mm — very large |
| Weight | ~90 g (3.17 oz) |
| List price | $365 (legacy page) |
Pricing
- MSRP: $365 — legacy official page (discontinued model).
- Street price (Sept 2026): used/vintage-new market only — expect $150–300 depending on condition and variant (PRW-3500T titanium band commands more). The PRG-340 is the current buy at its own retail price.
In the Box (new-old-stock)
PRW-3500 watch, tin/presentation box, manual, warranty card. Used purchases: verify band, sensor function, and solar charge before paying.
Warranty
Casio's published warranty has historically been 1 year on Pro Trek — UNVERIFIED from a primary page in this round's research; re-verify at casio.com before publishing. Discontinued status means new-unit warranty is moot; used purchases have no warranty.
Support & Parts
Casio's parts pipeline for discontinued models dries up over time — bands and bezels for the PRW-3500 are increasingly aftermarket/used-sourced. The solar cell and sensor module are not user-serviceable. Sensor recalibration (compass/altimeter) is owner-doable via the manual. For a discontinued watch, buy on condition: test the compass, altimeter, and solar charging before money changes hands.
Community Verdict
The PRW-3500's verdict is "the one that got away": enthusiasts praise the readable display, Tough Solar longevity, Multi-Band 6 convenience, and the full ABC sensor suite — and mourn the discontinuation, with the 53.4 mm case cited as the reason it never found the wider audience it deserved. Used buyers are advised to test sensors and solar function, since there's no warranty net. The PRG-340 is the accepted modern substitute, though some prefer the 3500's display. No fabricated scores.
Long-term durability & warranty-claim reality (enrichment — Sept 2026)
Pro Treks are famous for decade-plus service: the solar cell eliminates battery changes (the classic failure point), the resin case absorbs abuse, and 200 m WR keeps moisture out. Long-term PRW-3500 issues are the usual: band/strap wear (replacement bands getting scarce), sensor drift needing recalibration, and display fade on very old units. Warranty-claim reality: the 1-year window (unverified — re-check) is long past relevance for new-old-stock; Casio's service centers will still service some discontinued models for a fee, but parts availability is the constraint — confirm before sending a watch in.
Version history — year by year (enrichment — Sept 2026)
- 2023: PRW-3500 late-cycle; PRG-340 line takes the spotlight.
- 2024: Fades from current catalog listings.
- 2025: Effectively discontinued at retail; used market active.
- 2026: Gear Patrol confirms discontinuation; legacy $365 page persists; PRG-340 is the current Pro Trek ABC watch.
Head-to-head vs closest rivals (enrichment — Sept 2026)
- vs Casio Pro Trek PRG-340 (
/library/gear/navigation-safety/casio-pro-trek-prg-340/): the direct successor — current, warrantied, similar sensor suite in a more modern package. Buy the PRG-340 new; buy the PRW-3500 used only if you specifically want its display. - vs Suunto MC-2 (
/library/gear/navigation-safety/suunto-mc-2/): the non-electronic alternative — a baseplate compass that needs no battery, no sensors, no charging. The honest backup that lives in the same kit as any ABC watch.
Care & maintenance (enrichment — Sept 2026)
Keep it charged by light — a dead rechargeable cell left dead for months can fail to recover. Calibrate the compass away from metal; calibrate the altimeter at known elevations. Rinse after saltwater/sweat. The resin band wants occasional cleaning to prevent odor. Don't press sensor buttons underwater. For used buys: full-sun charge test, compass figure-8 calibration, and an altimeter sanity check against a known elevation.
Buying traps (enrichment — Sept 2026)
- The 53.4 mm case. This is the #1 reason PRW-3500s get resold. If your wrist is under ~7 inches, think hard — or buy the PRG-340.
- Discontinued = no warranty, scarce parts. Price used units accordingly ($150–300 by condition); don't pay near the $365 legacy list for a used watch.
- Test before you pay: compass, altimeter/barometer, and solar charging are all testable in a parking lot. A "mint" watch with a dead sensor is a parts donor.
Community Verdict — additional voices (enrichment — Sept 2026)
Additional sourced voices (Sept 2026): Gear Patrol's 2026 discontinuation note is the key status source; enthusiast threads value the display readability over the PRG-340's; used-market listings show steady demand from Pro Trek collectors. The −10°C rating and 200 m WR get cited as the specs that separate it from fashion ABC watches. No fabricated scores.
Key Specs gap-fill (enrichment — Sept 2026)
~90 g = 3.17 oz — light for a 53.4 mm ABC watch (compare a Fenix at ~80–90 g in a smaller case). Multi-Band 6 = nightly atomic-clock radio sync (US/Japan/Europe/China). Tough Solar = never needs a battery change under normal light exposure. −10°C rating = the LCD and sensors are specified below freezing — most ABC watches aren't. 200 m WR = genuine swim/snorkel safety margin.
Images
[research workspace][research workspace][research workspace][research workspace][research workspace][research workspace]
Research date: 2026-09-21. Prices ($365 legacy list / $150–300 used) observed 2026-09-21. Discontinuation per Gear Patrol 2026. Specs from Casio's legacy materials and retailer listings. Warranty duration (1 year) is Casio's published standard — re-verify at casio.com before publishing. Substitution (PRW-3500 → PRG-340) recorded in the lineup note. Qualitative pulse only.