Top L, OPW M1-24
Bot L, 409 11/16 sq. opening
small one in between has no markings
Largest, 9/16 hex- pat appd for. Has very faint lettering I can't make out.
R center, 1" sq. bottom & F in a diamond.
Bot. center, "made in usa" 11/16- 725B & B in a triangle.
Top R, No. 794- Insto. gas corp. Detroit, Mich. 7/16".
Bot. R, Brass-no markings- 3/8"

