I have a March of ‘85 Speedy 145.022 that isn’t a CRS case (I know CRS would be engraved under the reference if it were). Do CRS cases fall between the OP’s movement number range of 469mil - 481mil? My movement number is 468mil.
Here is mine. Currently at my watch maker getting a movement only service. Has the original bracelet too. Don’t mind the dust in the movement pic- that was taken before it was sent to my WM.
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