You mean as which model came first? That would be the 5E6, but I'm not sure it would be considered a 1959 model. There were even earlier versions. (Not '59 bassmans either of course). When I think of a "59 Bassman", it's the 5F6-A.
"In theory, there is no difference between theory and practice. In practice there is."
- Yogi Berra
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