This I know, some time during the first seven months of 1951, now for a guess, probably around May of 1951.
The 1T is the version of the 80 your pump is.
Send me your email address and I will put your name on my list of guys who want to know when my next Gas Pump Identification book some out.
Edited by Jack Sim (Sun Nov 12 2017 06:30 PM)
Author, Gas Pump Identfication books 1st & 2nd Editions & Air Meter Identification books
We rebuild ECO air meters and sell parts.