629 no dash

I've got an 8-3/8" 629 no dash. Pinned, counter-bored with TT, TH, TS.
Serial no. N850181. Can someone tell me it's shipped date?

According to SCSW4, the N800000 to N900000 range is 1980 to 1983 and being midrange of the 800000 serials, I would guestimate around late 1981 to early 1982. Interestingly, the N900000 to N97xxxx range is listed as 1982-1986, so there is some overlap.
 
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