Patrick,
I have a scanned Midland 1936 catalog in pdf. I can email it to you. Please PM me an email address.
I have Midland catalogs going back to 1914. There are not a lot of changes in the gun line between 1914-1936.

Your gun appears to be the "Perfection" Hammerless Gun on page 22 of the catalog. Gun Model was 8683. 18 gbp non-ejector, 22gbp with ejectors. It's a dead ringer right down to the engraving pattern and tear-drop.

Joe