I do know there are "I" serials in '67, and they went back to A in either '69 or '70, some debate after that. The sources I've read say Snyder shut down in '76, and AMF & Westfield/Columbia made Rollfasts long enough to fill existing orders. I've seen both. -AdamThe chart below has information from Adam @Rustinkerer and others; and a lot of backwards guessing into yesteryears.
View attachment 174743
Not sure how reliable any of it might be; especially the teens, twenties, and seventies.
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