I have a 1961 Maestro GA15rv amplifier that I love. I recently put a Celestion Alnico Gold in it and love it. I also have a clone of that amp (Built by Kevin Nelson at Gizmoe Amps) and I try to find a complimentary speaker for that amp.
I start with a Jensen, move on to a Fender Oxford from a 60’s PA column, then a Hudson Mill River Alnico and finally a Celestion G-H 12. The Celestion is so far the winner.