Thanks Darren/Mark, yes can confirm model number present and all other "expected" markings appear. It's clearly in good condition apart from the aparent dings on the left hand side of the case. I suspect the trouble the current owner went to to get a matchcing strap is a good indication purchase wise!

Its going to be one of those tough choices overnight i guess - i really like the re-edition Monaco cs2110 as well, but at present can only justify one!

: Carreras in the equivalent case have the model number on the case
: between the bottom lugs and the serial number between the top
: lugs. The engraving is quite shallow though and I think the
: PVDing process would easily obliterate it.

: The 510.511 PVD Carrera is in a different case but has no external
: serial number.

: If I recall, these Monzas have the model number engraved on the
: casebacks but not an external serial number, so I think that
: watch is correct but maybe someone with a Monza can confirm?