[Ron Ramirez]

As far as I know, only 1935 Philco models had gaskets on the shadowmeters. I've never seen any gaskets, or the remains thereof, on any other Philco model year with shadowmeters. You can easily tell which ones did have these, as the original gaskets usually melted into a gooey mess that covered the translucent plastic on the front of the shadowmeter, then hardened over time.

Actually, Blacksmith does state on his site that part no. GSm-Tuner fits model 19.

Used on models 14 (late version), 16, 17, 18, 19, 28, 29, 44, 45, 118 and many other 1933 - 1936 Philco sets.