An 'Alphabet Luger' as collectors have come to call them.
An early one with it's 'i' suffix. Likely 1922/23 production.
Commercial pistols with Military Luger ser numbering style as far as the frame # is concerned.
The Commercial Lugers were always ser#'d with just numbers starting in 1900,,no suffix.
When the numbers reached around 92000 in 1922/23, the decision was made to switch to the Milititary suffix style and use a letter suffix stamped underneath the numbers.
The Suffix denotes a block of 10,000 pistols.
Since the Commercial numbers were up to 92000 (approx) in 1922/23,,it was decided to use 'i' as the suffix as it represents the 9th letter of the alphabet. It took the place of the '9' in the ser# 92000.
So one of the first Alphabet Luger assuming it's Commercial ser# was say '92002' ,,would have been 2002i.
The 'i' stamped below the 2002 on the front of the frame.
The rest of the pistol being a Commercial pistol was still numbered in the Commercial Pistol style, with the matching numbers (last 2 digits) in slightly different locations than those on military pistols.
The sideplate # is on the bottom edge of the plate for example and not boldly struck on it's face.
The Proof(s) are commercial proofs.
Calibers can either be 30 or 9mm Luger. 30Luger is a common one.
BBl lengths vary as do some small details like lack of shoulder stock slots.
The 'Germany' export stamp is usually there somewhere as most all went out of the country to the USA at that time.
These are some nicely made pistols though the collectors of the WW1&2 stuff have passed on them, they are a fine example for Luger fans and shooters.