@Robert-Jan is right about the exact NASA serial numbers given to each Omega Speedmaster chronograph delivered to NASA
The National Air & Space Museum, NASA & Omega are still working on a final & correct listing of all NASA serial numbers for these watches...
In 1964 NASA received the watches to be tested and after qualification a first batch of (24 ?) Speedmasters was delivered on
April 23, 1965
At the time of the Gemini project, NASA had selected
30 astronauts for Gemini ... later NASA groups were solely involved in Apollo & Skylab.
The year was
1965 and for the
5 Gemini missions (III, IV, V, VIa & VII) scheduled that year, a total of
13 astronauts were involved:
Grissom & Young, McDivitt & White, Cooper & Conrad, Borman & Lovell, Schirra & Stafford... with backup Armstrong, Collins and See...
For the
5 Gemini missions for the year 1966 (VIII, IX, X, XI & XII) another
8 rookie astronauts were involved:
Armstrong & Scott, Stafford & Cernan,Young & Collins, Conrad & Gordon, Lovell & Aldrin... with backup Anders, Bean and Williams
... So of
30 available astronauts, only
16 actually flew on Gemini missions and another
4 were selected as backup crew members...
A long story short... we're trying to get for each astronaut the NASA serial #number for the Speedmaster watches he received
Yes, watches in plural as several astronauts received a pair of Omega Speedmaster chronographs to be used in training & actual flight
...
55 years later, we're awaiting the final update !