On mine the stamp is on the inner sidewall, next to the “DOT”. I believe the last 4 digits are the date, with the first two as the week and the last two as the year. So on my old ones 2109 means 21st week of 2009.
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~Matt
'69 Z/28 RS
'77 F100
'83 FJ60
'10 WC50
‘24 J250
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