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.
You may compare these with your own speakers to determine what you have.
Therefore, amps from January 1966 have the date code "OA" (A denotes January) in green ink.
The factory realized its mistake in February because these amps have a "PB" date code in black ink.
Still, I wouldn't be too quick to just glance at that tube chart and accept an "OA" as a January 1965 amp.
The biggest tip off would be the control panels which brings us to interesting factoid #2.
Devin runs Doc's Music in Springfield, Missouri and his interest lies in the woodie and tweed Fender amps made from 1946 through 1960.