Tested - the test button fires the flash correctly. The button does not lit though.
Flash Keystone Everflash 90 for Polaroid Tested Working JN
Keystone Everflash AF1 35mm Film Camera Auto Focus Built-In Flash Retro (Issue)
Keystone Everflash 3580 vintage camera untested
Miranda 930 TCD TTL Shoe Mount Hot Shoe Strobe Flash Guide No 90
Everflash Electronic Flash Unit - untested
410 BerkeyKeystone Everflash Rectangular Film Camera in Brown case, f5.6 lens
