Jeff, so I am assuming the Causey you mentioned was actually a Type 3 (not a Type 1) as I would have suspected.
This thread is getting pretty exciting because it is confirming a lot of theories that I have long had regarding the E121 set. Timeline is roughly, Regular E121 Series of 80, then came the "ends in eighty" back and the Type 3 back.
I would theorize that the last back (of the 3) produced was the Type 3, as if you look at the next E121 set they made (the Series of 120) it has the same style writing on that last line as the Series of 80 Type 3's--something I immediately suspected when that type was first discovered a few years back when I was looking over my E121's.
Good stuff!
-Rhett
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