All asymmetric cases, with distinctive shorter pushers. These pushers originally have fat necks but many have been replaced by Omega service items with short necks.
Dials come in all SWISS variations and are all marked “Professional”.
All are fitted with baton hands, and spear chrono hand.
This is the first reference to have the word professional on the dial, and the first asymmetric case, and this is the only confirmed reference to land on the moon:
This reference has such a wide variety of specifications, there are collectors who concentrate only on this reference with good reason.
This reference is unusual in that for the -66 there were two manufacturers for the case. See below in the -66 section.
The -63 also often caries the “symmetrical” clutch bridge, where as subsequent 105.012’s have the asymmetrical bridge that all later 321s carry.
Note as of September 2017: I have now seen a few 105.012-63 with an asymmetric bridge. I think I have to accept that either is correct. From a collectors point of view, the symmetric bridge is more interesting, but I would doubt it would affect the value.
2052 0xxx – 2052 1xxx
Very rare. The T’s are seen on all dials.
2052 7xxx – 2282 5xxx
2282 5xxx – 2452 7xxx
The 105.012-66 sub reference has two case manufacturers. Huguenin Freres who also made the cases for the previous references, and Centrale Boites.
The CB cases differ in that there is a small line between the polishing planes on the lugs. All the -66 case backs have a single step.
Here is the close up details of the lug facet on the CB case.
Here again are the two different case types for comparison, first the HF case:
Here is the CB case, with the facet lines clear:
2453 xxxx-2544 xxxx