that includes 1960, but again this date is that of movement production. the entire range corresponding to 2998-1 and -2 have their movements built in 1959 already.
the real question, especially for 2915s, is "what´s the proportion of today's 2915 fitted with the right movement number and not that of a Seamaster from the same age".
For the moment, it's impossible to state, information is missing. There has been a 2915 sold by a well-known auctioneer with a s/n dating it in 1956...one year before the 2915 went on the market.
that's one of the reasons why the production of early speedmasdters is difficult to estimate.
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