Hi
Thanks for the replies,
I already checked the mentioned links.
Clearly those reference number engravings are not the regular stamps seen on the 166.024 casebacks, hence i am seeking advice on this forum.
The caseback looks genuine Omega , the present stampings on the inner caseback look genuine too, were there any casebacks of the sort with blank reference numbers? So that presumably the engravings of the reference number were added later, or this is an early service caseback?
best
Ara M