Side by side

Hamilton Jazzmaster Maestro Auto ChronovsRGM Watches Model 300 Divers

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Hamilton Jazzmaster Maestro Auto Chrono

Owners widely praise the Hamilton Jazzmaster Maestro Auto Chrono for its dramatic increase in quality and attention to detail, its versatile dial layout suitable for dressing up or down, and its bulletproof build that remains problem-free for years. Accuracy figures range from gaining about 5 seconds per day to keeping time within 10 seconds per day even after extended periods without service. Some owners find the lack of a second hand a deal-breaker, and the 45mm size can be chunky and may not fit under shirt sleeves. Concerns exist regarding the movement's serviceability, high maintenance costs, and intervals. On balance, owners rate the Hamilton Jazzmaster Maestro Auto Chrono highly for its robust build and quality for the price, despite some reservations about its size and serviceability.

RGM Watches Model 300 Divers

Owners widely praise the RGM Watches Model 300 Divers for its outstanding quality, typical of RGM, and its rugged, cool appearance. Some owners note its 17mm thickness and small dial, with one comparison suggesting its quality does not match that of Omega. The watch is available with a bracelet in outstanding condition and an OEM rubber strap showing minor wear. On balance, owners rate the RGM Watches Model 300 Divers highly for its build quality and distinctive aesthetic.

At a glance

9 of 29 specs differ
Diameter
Jazzmaster Maestro Auto Chrono45mm
Model 300 Divers43.5mm
Power Reserve
Jazzmaster Maestro Auto Chrono60h
Model 300 Divers40h
Water Resistance
Jazzmaster Maestro Auto Chrono100m
Model 300 Divers762m
MSRP
Jazzmaster Maestro Auto Chrono$1,995
Model 300 Divers$4,450

Full specifications

Case

5 specs
Category
Chronograph
Diameter
45mm
43.5mm
Thickness
15.35mm
17mm
Lug Width
23mm
22mm
Water Resistance
100m
762m

Crystal & Dial

1 specs
Dial Color
Blue
Black

Movement

2 specs
Caliber
H-21
Sellita SW300-1
Power Reserve
60h
40h

Pricing

1 specs
MSRP
$1,995
$4,450
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