I need help identifying these objects. Sorry about the topic name. I know they were made before 1938.
Material: Rectangular non-magnetic silver-colored metal plate with non-magnetic copper-colored screw.
Weight: approximately .2 oz.
Condition: Good. Bent.
Speculation: This appears to be fastener intended for the same purpose as 2-6-S-03a but of slightly different design and somewhat heavier construction. In this case the surface to which the plate was attached seems to have rotated ninety degrees with sufficient force to bend the plate.


Material: Disk-shaped, non-magnetic silver-colored metal plate with non-magnetic copper-colored screw.
Weight: approximately .1 oz.
Condition: Good.
Speculation: This is a low-tech fastener intended for a very specific purpose. The screw appears to be a wood screw and the teeth may be designed to bite into wood and prevent to rotation of the plate which is attached to a surface by means of some kind of pin that goes through the hole in the plate.


Thank you.
Bob