Absolutely incredible. It's near impossible to follow that but for the record I'll add a couple of what I believe were 4 digit references that have passed through my hands.
I think this one meets the criteria as I believe the reference is 5631 with a 9 sub-reference. Numbers inside case back pictured below. The serial number puts it year or two earlier than yours. As noted by the watchmaker on the second photograph, this had a Cal 249 movement.
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