It depends.
Hi Anthony,
Please excuse the delay in replying. I had typed an answer yesterday, but then hit the wrong button & deleted it :-(
OK, the straight "there are less of them" answer is the 3366.51 is rarer. There are 34 less of them.
Answer #2, If you're looking to buy one now, I'd say the 3570.40 is "rarer". It was released in 2004 & is probably sold out ( & was only available in Japan) . The 3366.51 was released this year,may still be available/orderable from an AD & is available worldwide.
Answer #3. If you live in Japan, there are ( theoretically ) 2004 of the 3570.40 in Japan ( I know a few have "escaped" to other countries ), but the 3366.51's have been sold worldwide, so per country there are more. ( except in Japan ).
I think to be honest, with around 2000 of each in the world, they can both be classed as rare. You are not likely to ever see 2 of these watches in the same room at the same time.
For the Guys, who are not sure what we're talking about... (pics borrowed from the internet)
Here's the 3570.40 ...
& here's the 3366.51...
Limited Edition 35th Anniversary Apollo 15 Omega Speedmaster to commemorate the 1971 mission. This classic Omega Speedmaster is a Chronograph Speedmaster and enamelled in the back case of the Speedmaster is the emblem of Apollo 15. There are just 1971 of these Omega Speedmaster watches worldwide in recognition of the year Apollo 15 flew.
