1963 Fender Reverb unit. Letter code on tube chart is MA. That’s January 1963. So it was assembled from parts from late 1962 and shipped out early 63. As pictured. Sounds lovely.

These standalone Reverb units are the only way to get that perfect reverb sound. Since it stands in front of the circuit, it also functions as a kind of preamp. If you’ve never had one or tried it they are really cool. They also work great to add reverb to any vintage non-reverb fender amp.