Al, your Trommelmagazin is strange. The serial number is far too low for a type III made by Bing. Some details of the construction are a bit odd such as the three crimps on the rib that runs the length of the throat of the magazine and the location and placement of the serial number on the face of the drum.
The best quick discovery of your mags authenticity is to weigh it. An accurate weight will reveal whether it has real "guts" or is just a shell.
One last observation I can make is that the loading arm appears to be locked in the load position. If it is a real TM08, the spring may be seriously weakened if in this position too long.
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