Welcome to the forum. You have a very interesting rig. We will look forward to your photos.
Your Luger was manufactured in 1916. It was originally a Navy model with a 6" barrel (crown/M stamps). Following WWI, the barrel was replaced with a 4" version for use by the police (assuming it now has a 4" barrel). The 1920 stamp indicates it was government property in that year. It is not of itself and indicator of rework; however, the gun was reworked if it now has a 4" barrel.
The marking on the front grip strap (S.W.I.1448.) indicates the pistol was issued to the Schutzpolizei of Frankfurt/Main in the Wiesbaden administrative district. You will probably see evidence of an earlier mark that was ground off (e.g., remnant periods). I am not sure about the marking on the back strap and will be very interested in a good photo of it.
You have noted that it has a sear safety. The cut on the left side of the frame indicates it once had a magazine safety installed as well. These were installed in 1934 and indicate the gun belonged to the Revierpolizei (precinct police) of Frankfurt. The fact that it was canceled and presumably later marked I.S.B.619. suggests it was transferred somewhere from Frankfurt. I am not familiar with that marking.
I would be very interested in knowing the full serial number of this pistol for my database of German police markings. If you prefer not to post it, you may email me at the address below.
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