Your saw was made on Wednesday, May 22, 1985. It was the 38th saw made on line 7 that day. The serial number is decoded in this way:
1st character is the line it was produced on
2nd character is the year
Next three characters are the Julian date
Last four are the production number for that day’s output
This scheme applies to 8 digit serials after 1973 except for the line number. The 9 digit serials are after 1981 and started with c if I understand it correctly, I suppose that nine digit numbers could have existed as early as 1979, and they may have changed to using a letter instead of a number so that they would not run the risk of duplicating numbers in the 83 and later models since 73 was the date of the last previous s/n format change.
Ed
February 2023