Some help with a Commercial?

[barr44]

I recently acquired what appears to be a commercial model luger. It is serial no. 7305k with Germany stamped between the s.n. and the k on the front of the receiver. All of the parts are numbered with the 05, except the bolt which has a 55 on the back. The receiver and first toggle link are C/N proofed. It has a wooden bottom magazine which is not numbered. I believe the grips have been replaced, since they are not numbered. The barrel has no proof or s.n., doesn't even have a witness mark. I've read where some of the barrels on commercials weren't proofed or numbered. I suspect the barrel may have been replaced, however, it does appear to have the correct dimensions(6") and correct sight. The gun has been reconditioned and it appears to be a fairly good job. Besides the barrel, the serial number doesn't seem to match what I've been able to find on the commercial lugers. However, I'm not overly familiar with all of the variables with these guns, so I may be all wrong.
I would appreciate any insights and information, those of you with the knowledge would care to share with me.
I have enclosed some photos.
Thanks, barry