Hey Merlin,
Please also bear in mind that there can be discrepancies between the serial number and the style of Speedy. 861 Movements for example could sit on the storage shelf for a quite while before being put in a casing..I don't know the maximum amount of time, but from reading here I've read of about an 18 month delay. It really depends on how you choose to date the watch. Many folk get an extract from the archives and use the shipping date as a closer indication. I've got a Speedy Mark II 29,xxxxxx, it's got the early bracelet and end pins and I'd love to date it to the moonshot year 1969 using the various dating tables out there (some say yes, some say no, others say depends on the speedy model)...but I suspect it probably creeps into 1970.
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