Vintage Tube Amp

I’ve had this head sitting around in my garage for years, it’s a Vintage Fender BlackFace Showman Amp Head circa 1966-67; I don’t know much about this is.. It lights up when plugged in, I remember it worked before being put away. Looks to be all original, including the “widow-maker” two-prong cord.. Tolex looks good, there is a small 1 circle repair behind the handle, all else looks pretty good.. Back panel is fine, tubes may be original? Has “AB763″ model number at the top of inside label, and “PK” date code stamped.. Sorry I’m being lazy by not taking it apart for more pictures but will answer any and all questions if I can. I would recommend having this inspected/tuned up by an amp tech before using, and change that cord to a three-prong! Update 8/20: 4 added pics per member request- All power tubes are RCA, 3 6L6 & 1 7581.. Plus, all covers for rectifier tubes included, no footswitch..