1920 Commercial Rework,,more generally known lately as a 1920 Commercial Alphabet Luger.

One to five digit ser# w/a single lower case script letter suffix.

The blued extractor is correct along with 'strawed' trigger, safety, locking bar, ejector, mag release. The serial number is stamped & matching on the bottom of the side plate (last 2) which is correct for the Commercial numbering style. Can;t see the rest of the numbers..
The letter suffix to the ser# was added to the Commercial numbering in these postWW1 mfg'rs. Pre-WW1 Commercial did not use a letter suffix.
The grips may be orig also, they show the light right thumb wear in the checkering on the left grip as would be expected with a gun in this condition.
Calibers were often 30Luger but they were also made up in 9mmLuger.
Most of these reworks had the stock lug left intact from the Military guns they were made from.
Many destined for export to the USA have a tiny GERMANY stamped in the frame somewhere but it's not a given.

I'm not so sure it's a reblue,,looks pretty good to me but pics can be misleading. Could be a restoration perhaps(?)
Here's a nice restoration that could be it's twin brother, it sold for $1800+:
Excellent 1920 DWM Commercial Luger Chambered in Desirable 9mm-Pistol Firearms Auction Lot-499