Concertmate 500 (Casio SK-1) Portable 32 Key Sampling Keyboard

Description

Finally parting with some of my mini key collection. Not that I really want to, but turns out that during a pandemic, home repair costs skyrocket - who knew?
Concertmate 500, which is the Radio Shack rebranded Casio SK-1 - apart from the label, it is EXACTLY the same. Good condition, fully functional. Tested with batteries and AC adapter - it is missing the battery door, and the AC adapter is NOT included (keyboard only). Normal wear-and-tear for a keyboard of this age. Lots of good info on the web if you're into circuit bending.
http://www.vintagesynth.com/casio/sk1.php
Unit has been tested but because it is a piece of vintage electronics is sold strictly as-is. Please ask any questions BEFORE placing a bid!
Will be packed extremely well & shipped USPS priority from 19401. I do have several other keyboards up right now and will VERY happily combine shipping - less for me to pack.
Thanks for looking!