Aha! Yeah, looks like maybe a leading 8 actually on the 560 drum. Maybe during the resto the restoring owner could only source one of each. I don’t see any other markings on the 3841177 drum - maybe a replacement drum didn’t have a date stamping?
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~Matt
'69 Z/28 RS
'77 F100
'83 FJ60
'10 WC50
‘24 J250
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