Well, if we take another angle to look at this result and with the very strong proviso that the pix are really not good enough to inform a purchaser of the authenticity of the dial (the caseback engravings look correct from what I can see but I'm no expert on these):
When compared to a full spec Rolex RN-issued Submariner, which can fetch up to $100k USD, a genuine RN-issued Seamaster 300 in all correct condition seems like a proper bargain. Especially since there are
fewer of them than the Rolex Sub.
And I can't speak to what is happening in the civilian SM 300 market, as I haven't been following it lately, but the price of an RN SM300 seems to have been steady for at least the last several years at right around $10k for a good one give or take. Pro dealer's tend to ask more, of course.
Just my 2 cents & best,
Tom
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