Another nice topic but the OP should be aware that both James McDivitt and Ed White wore a pair of Omega Speedmaster chronographs...
By that time, NASA had at least 4 Omega Speedmaster chronographs and wanted to fly all 4 during the June 1965 Gemini IV mission...
More photos at MoonwatchUniverse ( month June 2017 posts ) : https://moonwatchuniverse.tumblr.com/archive
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The above range from Speedmaster101.com isn't 100% accurate and I don't think we'll ever truly get it 100% accurate. By way of example: my Ed White has serial Number 20,525,XXX with an extract of the archives giving a date of X Dec 1964 and with a caseback showing 105.003-65.

 

Isn't there a fair chance yours is a -63 or -64 which has had a later -65 caseback added as a replacement? Do your lugs have obvious bevels? Sometimes movements were used out of sequence of course, but the earliest -65s seem to date from March-April 1966.

 

Archives do not give sub-reference (i.e. your extract will say 105.003 only, so the -65 is not guaranteed unfortunately).

From researching at the archives, have a look at 'Table B' here : http://www.moonwatchonly.com/omega-...view-of-the-speedmaster-moonwatch-production/

 

Indeed archives do not give a sub-reference but my point was that my Ed White has characteristics (using the information on the Speedmaster101 site and the watch) as anywhere from '63 to '65. The information at moonwatchonly (that I'm well aware of) gives the serial number as a '63 or '64. The ONLY reference to '65 is the stamp in the caseback.

My understanding of my Speedmaster after a few e-mail exchanges several years ago with Omega is that it's a 105.003-64 that was fitted with a '65 caseback at release. The bracelet is stamped 4/64.

These minor anomalies are indicative of 'loose' config control of parts in those days that was probably not considered important at the time.

 

Not sure I understand your point. How does your watch watch contradict the serial range on SP101? The caseback swap could have happened at any time, most likely at a service or it could be the original back got chewed up and was replaced.

You may be able to figure out if it is a -63 or -64 from the lug profile

 

My serial of 20,525,XXX is listed there as a '63, it isn't it's a '64 according to the archives (and conformed in further correspondence with Omega some years ago). The caseback is also known to be original to the watch.

 

Have your lugs got the prominent 45 degree facets? The -63 and -64 lugs differ.

 

Pictures?

It might help.

 

Although it will not mention both serial numbers of the Speedies 105.003-64 worn by Ed White, this excellent book will mention the Omega Speedmaster watches worn during Gemini IV mission in June 1965:
https://www.springer.com/gb/book/9783319766744
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The interesting read mentioned above is available now: https://www.springer.com/us/book/9783319766744

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I am late to the conversation but I fell down the rabbit hole of researching Ed White's Speedy and I think you are right about it being a 105.003-63.

Based on the photo @gdupree posed from The Ed White auction appears to have an A6, high swiss made dial which would make it 63 unless it was a special batch.