Vintage Drum Forum newbie needs help identifying a snare drum.

Have looked for information on interior of shell and there are no indicators. Both hoops and the shell have the letters A M and a logo pressed in the metal. Four lug, free floating type shell design, calfskin heads, gut snares. Performed magnet test and the magnet did not stick anywhere. it measures at either 20cm x 6cm or, 7.89" x 2.37" approximately. Obviously a marching snare drum. In great shape, gut snares are a little loose but the drum sounds nice. Just looking for any information on manufacturer, origin, age, material, etc. Any knowledge or help would be greatly appreciated. Thank you very much.