American Litho. (ALC) started producing the Gold-bordered sets (sports & non-sports) in the Spring of 1911. Here are two popular examples.
The basic T205 set comprises of 200 cards. The T80 set has 50 cards, as do many other non-sports sets (then there are some that consist
of 100 cards). From these numbers I think we can conclude that ALC, after the T206 production runs, switched to a different format (consis-
tent with their printing equipment).
TED Z