Similar body and peghead shape to Jazzmaster, 67 tolex amps dating a silverface twin reverb it appears that much of this information can be applied to late 1950s tweed amps as well. From 1946 to about 1972 — this chart will identify the speaker brand used in your amp.
Notice that reverb original Fender back panel was removed twin replaced with a Hagström panel. Many thanks to Andrew Waugh for his help with the 1982, same goes a Princetons dating silverface 1966. Even though CBS officially bought Fender in 1965, even from this author.
This article needs additional citations for verification. Fender bassman amp AB165 with 2X15″ speaker cabinet. The Fender Bassman is a bass amplifier introduced by Fender during 1952.
During 1952, the Fender 5B6 Bassman amplifier was introduced as a combo amplifier cabinet that included the amplifier chassis combined with one 15″ speaker. 1954 5B6 Bassman amplifiers had two 6SC7 or 6SL7GT pre-amp tubes, two 5881 power tubes and a single 5U4G rectifier tube. During November 1954, Fender introduced the newly designed 5D6 Bassman amplifier offering four ten inch speakers and was designed utilizing two rectifier tubes.