Not the original neck or bridge but with these pickups I'm thinking a 50's model. Was given to my brother and I'm trying to figure out model. There was no pencil marking when putting the neck on. Thoughts or help much appreciated.
Looks like a Harmony to me, but I can't find anything that matches that pickup configuration and control layout that might confirm that it is.

EDIT: On closer inspection, I think it's actually not a Harmony at all - Looks very much like a Kay Speed Demon.

Rig Winter 2017:

Fender Jazzmaster/Yamaha SG1000
Boss TU-3, DS-2, CS-3, EHX small stone, Danelectro delay
Laney VC30-112 with G12H30 speaker, or Session Rockette 30 for smaller gigs
Elixir Nanoweb 11-49 strings, Dunlop Jazz III XL picks
Shure SM57 mic in front of the amp
Yep, I agree that Kay looks real convincing...
Hmmm...I wonder what this button does...
stuff like that got rebranded for all kinds of things with various parts (the maple neck for example). it'd be pretty tough to tell exactly what it is but it does seem to be quite similar to that speed demon (with a different neck?)
punk isn't dead, it's always smelled that way.

"A perfection of means, and confusion of aims, seems to be our main problem."
Poor thing is a 60's manufactured K573 noted for the 3 speed bump pickups. Made by Kay for Sears and Western Auto.