It’s looking like the timeline is something like:
Late 80s: six digit serial numbers starting with a 2xxxxx
1989: five digit serial number, hss
Early 90s: 6 digit starting with 01xxxx, HSS
Late 80s: six digit serial numbers starting with a 2xxxxx
1989: five digit serial number, hss
Early 90s: 6 digit starting with 01xxxx, HSS
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