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311.33.42.30.01.001 is not a code for the leather strap. It's the reference number for a Speedmaster that comes on leather strap. Just contact an OB and ask them the price for the leather strap that comes with a 311.33.42.30.01.001. It would be leather with alligator embossing, not genuine alligator.
If you don't want to pay for an OEM Omega strap, take a look at the suppliers in the below thread. You just need to look for a strap to fit a 20mm lug width. If your wrist is average size, most straps will fit. It will only be an issue if you have a very thin or thick wrist but there are manufacturers who produce long and short versions of straps, and some will make custom straps. There are plenty of options available for good quality non-OEM leather straps.
https://omegaforums.net/threads/«watch-strap-ressource»-where-to-buy-good-quality-leather-watch-straps.82232/
I think a lot of alligator straps anymore are calf or something else that is stamped with the scale pattern. Alligator and some other exotic leathers can be more difficult to import, and there are restrictions due to concerns about sustainability.
Sorry to revive an older thread. The fact that the OEM alligator strap is not real alligator surprises me. Is this true?
I'm looking to get the alligator and deployant for my Speedy Pro but will look elsewhere if it's just embossed leather.

The strap for that watch is alligator on top, and calf on the underside. Not sure why it's being described as just stamped...perhaps user @queriver could let us know why he stated that.
Here's an alligator strap I ordered in and received just before Xmas. You can see the specific species listed on the documentation...
The specification for the material on this strap is the same as the one for the Speedmaster. Omega wouldn't tell you it's alligator, and not give you genuine alligator...
The strap for that watch is alligator on top, and calf on the underside. Not sure why it's being described as just stamped...perhaps user @queriver could let us know why he stated that.
Here's an alligator strap I ordered in and received just before Xmas. You can see the specific species listed on the documentation...
The specification for the material on this strap is the same as the one for the Speedmaster. Omega wouldn't tell you it's alligator, and not give you genuine alligator...