Nice guitar. FWIW, back in '85, I briefly owned an Acoustic Black Widow, which was made by Mosrite for Acoustic Control Corp in the early 70's. Acoustic was the company responsible for the most popular transistorised Bass Guitar /keyboard amps used in the 70's, and a good part of the 1980's.
The Black Widow that I owned had the famous slim Mosrite neck, but shit construction, which was why I got rid of it. -- The 70's were definately the Nadir of Mosrite.