# Casio F91W-1 Review by A.I. WatchMetrics

## Watch Summary
The Casio F91W-1 is a minimalist digital tool watch in a lightweight black resin rectangular case with an LCD display, targeted at budget-conscious everyday wearers seeking reliability without frills, featuring standout alarms, a 1/100-second stopwatch, hourly chime, day/date, and an impressive 7-year battery life powered by the Module 593 quartz movement.

## Overall Watch Rating: 5.1/10.0

**Versatility Metric (9.0/10.0)** - Its ultra-light 21g weight and simple digital interface make it exceptionally versatile for daily wear across casual, sports, and tool scenarios, outshining bulkier analogs like basic Timex Ironmans.
**Functions Metric (7.5/10.0)** - Packed with practical digital features like alarm, stopwatch, chime, and day/date, it punches above its weight compared to barebones quartz watches from entry-level brands.
**History & Innovation Metric (7.2/10.0)** - Casio's pioneering role in affordable digital watches and the F91W's cult status for durability and minimalism earn it strong marks, akin to the original digital icons from the 1980s.
**Brand Metric (4.8/10.0)** - Casio delivers reliable mid-tier performance with global accessibility and quartz expertise, on par with Citizen's everyday digital offerings.
**Dials & Design Metric (5.8/10.0)** - The clean LCD layout and iconic resin tonneau design offer timeless simplicity, benchmarking well against other no-nonsense digitals like the Timex DGH series.
**Movement Metric (3.5/10.0)** - The Module 593 quartz provides accurate, low-maintenance operation with a 7-year battery, but lacks mechanical sophistication seen in even basic automatics from Seiko.
**Complications Metric (4.0/10.0)** - Basic alarm and stopwatch functions are functional but unrefined, similar to entry-level quartz chronos without advanced timing features.
**Material Metric (2.5/10.0)** - All-resin construction prioritizes lightness and affordability over premium feel, trailing far behind stainless steel cases in mid-tier divers like the Seiko SNZH.
**Rarity Metric (1.2/10.0)** - Mass-produced at low price points with ubiquitous availability, it offers no scarcity compared to limited-run microbrands.

## Total Performance Score (TPS): 9.4

## WM Collector Grade: A

## Performance Insights: Exceptional versatility and functions drive strong value in a mid-tier package, far exceeding its sub-$20 price with reliability that belies its basic materials.

## TPS Interpretation: Exceptional Value: This watch overdelivers on practical utility and endurance at a fraction of its implied quality price, making it a no-brainer for functional collectors.

## Watch Data
[https://www.casio.com/content/dam/casio/us-watches/images/product/standard/F91W/F91W-1_main.jpg] - [https://www.casio.com/content/dam/casio/us-watches/images/product/standard/F91W/F91W-1_back.jpg]; [N/A] - [N/A]; [N/A] - [Iconic Digital Beep]; [Casio] - [F91W-1]; [Japan] - [https://www.casio.com/us/watches/product.F91W-1/]; [https://www.watchmetrics.ai/review/casio-f91w-1]; [Quartz] - [Module 593]; [0] - [Iconic lightweight resin digital watch with alarm, stopwatch, hourly chime, day, and date; 7-year battery life; ultra-thin and durable for everyday use.]; [38.2] - [35.2]; [8.5] - [16]; [30] - [7 years]; [N/A] - [No]; [0] - [Resin]; [Resin]; [Fixed Resin]; [Resin]; [Two Push Buttons]; [Resin]; [Rectangular]; [Digital LCD]; [Digital]; [Yes]; [No]; [No]; [Yes]; [Yes]; [No]; [No]; [No]; [No]; [No]; [No]; [No]; [No]; [No]; [No]; [No]; [No]; [No]; [No]; [No]; [No]; [Yes]; [Yes]; [No]; [No]; [No]; [No]; [No]; [No]; [Yes]; [No]; [Yes]; [No]; [No]; [Yes]; [Yes]; [No]; [No]; [No]; [No]; [No]; [No]; [9.4] - [A]; [145];
**A.I. WatchMetrics Review v37.4 Grok 4 Fast. December 19, 2025.**