The back on this 250-4 is different then the one on the reverb store pictures. It has on the back 6 1/4 inch jacks. Reverb,fuzz,boost,output,tape record, and way on the right corner module input. No place for reverb lock handle. Looks like a opening for a slide switch on the far left side by the slack wind up which is open, nothing in it. So I don't know if this is really old or came later without the reverb lock. Serial number 104867.