Hi,
I took a look at various Navy Lugers being offered currently on GB. Mine has no date on chamber and the 1917 Navvies on GB had no date I don't think date on mine was scrubbed. In addition the 2 digit numbers are hidden, under neath locking bolt and side plates on both GB lugers and mine. There are no unit markings on grip straps on mine and I couldn't determine if the ones on GB have them.
All in all with a 4 digit serial number in 5000 range I don't think think this a commercial.
Thanks for your comments.