To put it mildly, I service a lot of Speedmasters, from all different eras. I have never seen, and AFAIK there never was, an 1861 base plate that was not Rhodium plated.
The photos are not lit well and the colours seem off, so it's hard to judge. If you have the watch in hand, does the main plate look yellow when compared to the other plates? Just wondering if the plating may have been stripped from an 1861 base plate to make it look a little less obvious that it's a franken...
Cheers, Al
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