Here's a nice 70s vintage flash with an accessory filter kit.  Filters are red (small crack; perfectly usable), orange, yellow, "uv" blue, green, 28 and 21/24 (diffusers for wide angle lenses).  Flash can be set manually in full, 1/2, and 1/4 power, or used in "auto" where you set your aperture based on film speed (e.g. f8 at iso 400) and the flash cuts power when the right amount of light has bounced back to it.

Sunpak 211 Flash with colored filter kit. Condition is "Used".