Apples and oranges, but they’re both delicious fruit. Here is a Rolex Submariner next to a GMT-Master II.
A few basic differences between 16610 vs. 16710:
| Rolex Submariner | Rolex GMT-Master II | |
| Reference: | 16610 | 16710 |
| Diameter: | 40mm | 40mm |
| Movement: | Automatic | Automatic |
| Caliber: | Rolex caliber 3135 | Rolex caliber 3185 |
| Bezel: | Uni-directional bezel (only rotates counter-clockwise) | Bi-directional bezel (rotates in both directions) |
| Bezel Color: | Available in black or green (anniversary model) | Available in black, red/black (Coke), red/blue (Pepsi) |
| Water Resistance: | 300m/1,000ft | 100m/330ft |
| Crown: | Larger Triplock screw-down crown | Smaller Twinlock screw-down crown |
| Time Zones: | One | Three (24 hr hand + bezel) |
| Clasp: | Larger clasp w/ wet suit extension | Smaller clasp, no extension |
| Date: | Available without a date | Always has a date |
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