WATCH POP

Hello, all. I have some questions about specific Speedmaster models.

These are model #s 3870.50.31 and 3873.50.31. Based on the Omega website, they are leather-banded Professional models, the former having the Hesalite crystal, the latter having a sapphire crystal.

Are both watches 42mm in diameter?

What are the casebacks? I imagine the Hesalite model is solid, while the sapphire could be a display back...does anyone know what the wording on each of the backs, or have scans of them?

I have narrowed by next purchase down to these and two other watches, and the details may push me in the right direction.

Thanks.
Yes, both are the same size at ~42 mm.

Yes, the current Hesalite crystal model has solid back, sapphire crystal model has display back. Vita somnium breve. Thanks, fivedime.

Does the solid back Hesalite model have any wording on the back?

Does the display back sapphire model say the words: "The first and only watch worn on the moon."? I've read that is factually incorrect and do not want to pay a lot of $$$ for something that one of my smart friends is going to punk me with. Now you're gonna make me go get my Speedy ;-)

Solid back says, "Flight qualified by NASA for all manned space missions...the first watch worn on the Moon."

I believe they have corrected the display back and it once again just says "First watch worn on the Moon..." but I could be wrong. Vita somnium breve. Again, thanks.

Just the info I needed!
I have yet to have any confirmation of that fact.

Does anyone have a recent sapphire/sapphire or Speedy Pro Moon Phase with the correct wording?

John