Helm & Hahn Co. marks

velvetboxsociety.com

Undated

10K HH

Recorded circa 1934, 1943 and 1950.

Pittsburgh PA, United States

h, h h, hh, trade mark

Undated

PA

Pittsburgh PA, USA

c.1934 – c.1943: Manufacturers Building Pittsburgh | c.1950: 530 Duquesne Way Pittsburgh 22 | Rings & Mountings