Lots of different speakers were used in the blackface and silverface era Fender amps.
In a BF Vibrolux Reverbs you could have either Jensen, CTS or Oxford, the BF Super Reverbs had Jensen, CTS, Oxford or sometimes JBL, the BF Pro Reverb had Jensen, Oxford or Utah, .
In the silverface era Eminence, Oxford, Utah and Rola were more often used and Jensen was phased out.
Even at we struggle with keeping a correct amp and speaker model overview.
In 1946, Fender began manufacturing a series of now-legendary amps: the Deluxe, the Professional, the Dual Professional, and the Princeton.
Many of these resources refer to source-date-codes located on pots or speakers within your amplifier.
Please keep in mind that those components must be original to get a valid date for a vintage guitar amplifier.
His particular area of expertise is in Fender amps made from about 1960 through 1967.
Devin runs Doc's Music in Springfield, Missouri and his interest lies in the woodie and tweed Fender amps made from 1946 through 1960.