I'm glad you were able to obtain the records

They have changed the process a bit so I'm curious how smoothly your application went? Also very interesting to note that your Chronometre Royal RN chronometer saw submarine service which marks another similarity with 8855 discussed here:
www.watchprosite.com
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The story of these CR military movements hasn't been fully written. Production of the Chronometre Royal pocket watch calibre ceased around 1915 but we know that a large stock of several hundred existed as a result of the debacle in South America. According to the Annales of Vacheron et Constantin these were exhausted by 1938, but clearly the silver and brass-cased military versions issued during WWII are evidence to the contrary. Two possibilities; the wartime CRs were indeed assembled from original stocks or V&C resumed production for the purpose of supplying chronometers during the war. I favour the latter because some of the more unusual military CR movements were rhodium plated; a feature not available with the old-stock gilt movements.