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Yep
Pusher bottoms are threaded, which I don't think is period-correct for the 2915-1. However, the springbars seem like they're original, and I feel like that would be a detail easily overlooked. The missing groove at 12 probably means this isn't a 2915-1 case though? Perhaps the bezel and crown are correct, but it seems like the case may be from a later Speedmaster.
Pushers on the very first 2915-1 are threaded into the case with a outer gasket like the ones seen here 👍
https://www.ebay.co.uk/itm/GENUINE-...599472?hash=item23d4a77470:g:0SAAAOSwNKlejf6g