Congrats, wear it in good health. BTW, you blurred out the SN on your lug but left it on the movement.
My 321 was sold in late Jan 2021, and comparing my serial number with yours there is a difference of about 3400, and that's over a 2 3/4 year period, or about 1235 pieces a year in this '88' serial number block. There are some other 321s with a different serial number sequence but it seems they are below their 2,000 target limit which has been the general consensus.
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