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Omega Seamaster 300M Specifications
| Reference | 210.30.42.20.01.001, 210.30.42.20.03.001 |
|---|---|
| Case Size | 42mm |
| Lug Width | 20mm |
| Lug-to-Lug | 50mm |
| Thickness | 13.6mm |
| Case Material | stainless steel |
| Crystal | sapphire with anti-reflective coating |
| Water Resistance | 300m |
| Movement | Omega 8800 (automatic) |
| Bezel | unidirectional rotating dive bezel (ceramic) |
| Crown | screw-down with helium escape valve |
| Case Back | display caseback (sapphire) |
| Price Range | $5,100-$5,600 |
Compatible Straps for the Omega Seamaster 300M
The Seamaster 300M uses a 20mm Lug Width and is compatible with the following strap types.
| Type | Recommended Brand | Why It Works | Price Range | Link |
|---|---|---|---|---|
| NATO/ZULU | Omega OEM | Classic look, easy to swap, fits 20mm lugs | $15–$80 | |
| rubber/silicone | Barton | Water-resistant, comfortable for daily wear | $15–$80 | |
| leather | Artem | Dresses up the watch, fits 20mm lugs | $15–$80 | |
| OEM stainless steel bracelet | Crafter Blue | Compatible with 20mm attachment | $15–$80 | |
| mesh bracelet | Rubber B | Adjustable fit, dressy appearance | $15–$80 |
Replacement Parts for the Omega Seamaster 300M
| Part | Description | Compatibility Note |
|---|---|---|
| crystal | Protective cover over the dial | Fits 42mm case |
| bezel insert (ceramic) | Outer ring marking | Matches unidirectional rotating dive bezel (ceramic) configuration |
| crown | Time-setting knob on case side | screw-down with helium escape valve type |
| spring bars | Pins that hold the strap to the case | 20mm, 1.5mm diameter recommended |
| bracelet clasp | Replacement component | Check compatibility with Seamaster 300M |
| helium escape valve | Replacement component | Check compatibility with Seamaster 300M |
Modding the Omega Seamaster 300M
The Seamaster 300M is a popular platform for modding. Here are the most common modifications.
- strap swap — Upgrade to a premium aftermarket strap or metal bracelet.
- OEM bracelet to rubber — Upgrade to a premium aftermarket strap or metal bracelet.
- aftermarket bezel insert — Swap the stock bezel insert for a ceramic, lumed, or differently colored option.
Frequently Asked Questions
What lug width is the Omega Seamaster 300M?
The Seamaster 300M has a 20mm lug width.
Is the Seamaster 300M a good dive watch?
Yes. With 300m water resistance, a helium escape valve, a unidirectional ceramic bezel, and screw-down crown, it is a professional-grade dive watch.
Can I swim with the Seamaster 300M?
Yes. The 300m water resistance rating means it is suitable for swimming, snorkeling, and recreational scuba diving.