[Ron Wood]

I have no positive evidence, just conjecture. The large numbers running lengthwise is indicitive of an eary military style marking as Dwight observed. I would also guess that the 22 is a property number (rack number that matched the property/rack number of the Luger). Somebody had an early military magazine with a very nice wood base and lousy tube. They put the base on a blued tube. I don't think that the radius of the tube cutout matches the radius of the base knobs even considering shinkage and the pin has been battered by improper installation. Put the base back on the proper tube, using the proper pin and careful installation, and you have a nice magazine.