zOwie Omega Discussion Forum

: I just got pre-owned omega speedmaster
: (reduced) from my friend but it seems to be
: very light comparing to the yacht master
: (oyster perpetual date) mid-sized rolex. Can
: anyone in this forum tell me the exact
: weight of 3510.50?

: And my friend told me once the serial# of this
: watch was 57xxxx71 but when I got the watch,
: the # is one digit different. The last digit
: is not 1 but 0. He explained that the last
: digit can be changed from 0 to 1 for some
: reasons. Can any of you help me explaining
: this? Your help is greatly appreciated!

Omega serial numbers are (with many exceptions)8 digit numbers essentially assigned sequentially. The next watch after 57'xxx'x71 would be 57'xxx'x72. [Much later editing and correction: however, serial numbers were assigned to the production of a calibre . . . . it gets complicated]

I am uncertain of the specific dates, but prior to the mid-1980s there was only a single sequence of digits, with the last numbers used in the range of 56'xxx'xxx or 57'xxx'xxx. [the date changeover to multiple sequences was 1995 -- search for more recent posts by me for a more elaborate description]

Since that time, Omega has used several sequences, including 57'xxx'xxx, 60'xxx'xxx, 70'xxx'xxx, and 80'xxx'xxx. It appears the serial numbers are now used for different "collections".

My Seamaster Chrono Diver has a 80'xxx'xxx number, a Museum Collection watch has a 60'xxx'xxx number and my Speedmaster Triple Date has a 57'xxx'xxx.

Hope this helps.