No secrets, but there is a lot of information out there.
And its free to anyone who types in
www.speedmaster101.com
This forum is full of people who love to help, and sometimes we can be a bit short, because, well - we are human. And sometimes the questioner less due diligence - so it can feel as though we are being asked to do all the work for them. Some times we love to do it, and sometimes we are not in the mood. Don't take it personally.
@rolexfantastic is quite right, This is quite an obvious assembly, or at the very least, a movement transplant. For all the reasons
@Davidt3449 points out. Whenever I look at a speedmaster the very first thing I do is check the serial is in range.
The dial looks to me like it spent a lot of time outside of a watch - its dry, degraded, damaged - as though it had been in a watchmakers reject drawer. Another pointer to an assembly.
I wonder who is offering it, and for how much? (My bet is a dealer and $10,000+)
For a price, anything is worth having. This one is worth the price of components, so Case ($1200 -2000) Dial (500-3000 depending on how it really looks) and bezel ($800) and movement ($1500 if working and speedmaster, less if not).
So my guess is it is worth $3000-5000 on an open auction, but much more if the buyer doesnt read this and thinks it is an original tropical 105.003.
Which it isnt.
This is:
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