This is related to a KC5295 theremin kit from Jaycar. Theremin, and Everywheremin are also in this family of theremins but are newer models. Heremin was donated with less information than its counterparts.
Musical Electronics Library
https://www.facebook.com/groups/musicalelectronicslibrary/
Sub-Basement of the Parisian Tie Factoryhttps://www.facebook.com/groups/musicalelectronicslibrary/
4 Poynton Terrace
Auckland, 1010
New Zealand