There is no " / A "... So the exact reference is 5218-302, and 5218-304, while on the current Mare the Ref is 5218 - 301 / A...
Don't ask me why, I don't know.
The smooth bezel is a monster, a very rare piece ( only 31 were made under the Pre V era ).
I'm sad to have let it go, but happy to see it on a friend's wrist.
Best,
Nicolas.