VINTAGE brass fitting & hose couplers PLEASE LOOK!

If the angles matched, you would not see a "contact patch" like that. These are the dimensions for "AN" fittings. If yours does not match this in every regard, it is something else. These are AN fitting dimensions since WWII:
Mechanical-JicDimensions-800.jpg
Note a mistake in this table: Col. A, Size 2, should be .062" not .620".