Pro Reverb AA1265, AB668, AA1069, AA270 (silverface)
A10000 to A10500 – 1967
A10500 to A12000 – 1968
A12000 to A13300 – 1969
A13400 to A14500 – 1970
A14500 to A15000 – 1971
A15000 to A15600 – 1972
A15600 to A17200 – 1973
A17200 to A19700 – 1974
A19700 to A20000 – 1975
A20000 to A21500 – 1976

from Greg Galiano

More serial numbers and productions data at 20th Century Guitar Mag

(or here:  Dating Fender Amps )

If you need to change your Tubes…You’ can find all Tube Amps Overhaul Kits at Torres Engineering

Blackface schematics: