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Brutus, I believe Thomas Organ bailed out on Vox around '70, or maybe early '71.......

Dennis is correct (as usual), 1971 I think is when they pulled the plug.
My guess would be 1967 or 1968, but without seeing the amp I could be wrong (as I often am).

Brutus, do you have an ohmmeter? The fast test is to remove the back panel (4 screws) and then pull the input plug from the tank (on the left side). Take your ohm meter and read the resistance across the RCA jack. One lead on the outer shell and the other lead in the center hole. The input side could read as low as 2 ohms to a high of 200 ohms. This depends upon the impedance of the input coil. Do the same test on the output jack, but here you should always get 180 - 200 ohms.

If you get open readings on either side, you will need to remove the tank and check the wires and coils. To remove the tank, remove the two screws and pull it straight back and out of the head cabinet.

Thanks guys I always hoped it was a late 60's amp but I was never sure. I will post some pics soon as I dig in to it.

Well, your Avatar's a good start! ............

I need to make a factual correction to my above post:
The input jack is on the right side and the output is on the left side.

Also you do not need to remove the back of the cabinet to pull the plugs out of the tank to test the coils. Both of the plugs are visible and accessible through the bottom opening of the back panel.

I checked my Buckingham which also happens to be a model V1121, and the input coil read around 180 ohms.