According to the Omega Archives, the present watch was shipped to Hong Kong on 28th January 1963.
The reference 2998-62 was the final version of the reference 2998 made. It served as the transition to the 105002-62 SC and was the first Speedmaster in space, worn by Wally Schirra as his personal watch on the Sigma 7 mission of October 1962. This example has a dial with light chocolate color showing the first stages of tropicalization.
DEPORA case back
Further to its very appealing dial, the present watch offered for sale here bears a special inscription on its case back : M.051- DEPORA. The information about this personalization is rather vague, but it has been confirmed that the few examples recorded had been sold in 1963. The word DEPORA seems to be an abbreviation of Department Olah Raga, the Indonesian Ministry of Sports and M.051 stands for a three-figure number.
A similar DEPORA example is illustrated in Moonwatch Only, The Ultimate Speedmaster Guide by Grégoire Rossier & Anthony Marquié pp. 160-161.