This is a vintage Fender Tube Reverb Unit, model 6G15, made in the United States in 1963. It is an analog unit designed to be used with electric guitars. The unit has a pre-CBS tube tank and a tan cream tolex finish.

Original and beautiful!  Sounds spectacular, and the condition can be seen in pics!  Original footswitch.  Very well maintained and stored.  Thanks for looking!  Priced to sell!!!