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Great post OP! Yes, some Octos had winding problems (some reported 'jumping seconds') and so that it probably addressed with this movement variant.

 

Yet why remove the gold-filled lettering and would love to know why a change in the balance wheel? For clarification, a new movement number (??BVL 138a??) is desired to reflect the updated movement.
Love my 'old' Octo FS and feel it better presents a finer, more luxurious timepiece movement. jmho

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