Commercial Luger date?

[MFC]

Your description doesn't fit Luger production of that time. Military Lugers of that time frame have a date over the chamber. Commercial Lugers made in that time frame have a 5 digit serial#. Does it have dished or flat toggle knobs? Are the serial#'s stamped in plain sight or are they stamped in the hidden/commercial style? Is the barrel 4 3/4" or 3 7/8" long? Is there a stock lug on the rear grip strap? Does it have a grip safety?
As David stated pictures would answer many questions.

[tugbrass1]

Hi MFC,
There are no marks or stampings over the receiver. It is a perfect blued surface with no tool marks.
The serial number is 8990.
It has flat toggle knobs.
The serial number appears in two places, on the front of the receiver just below the barrel in plain sight and it also appears on the bottom of the barrel just in front of the frame.
The overall barrel length is 3 3/4 inches long. The length from the muzzle to the front of the receiver frame is exactly 3-inches.
Yes, there is a stock lug located at the rear bottom area of the hand grip. No, it does not have a grip safety. The only reason that I refer to this handgun as a commercial pistol is because that's how the previous owner described it.
I fully understand that a camera image is worth a thousand words.
Joe McHugh