Hi, and welcome go the forum.
It's difficult to be sure, but from the pictures it looks like this Luger may have been refinished. This is indicated by the lack of "halos" around the barrel stamped serial number, the dark blued pin that holds the toggle axle in and the general surface appearance. It's hard to judge finish, especially in flash photographs.
Your gun's full serial number is "2858o" including the suffix letter.
This variation is called a "DWM Alphabet Commercial" and was not used in military service. It was an export gun made in the mid 1920's (as indicated above) and was helping earn the Lowe group conglomerate some much needed foreign funds during a very difficult period of post WW-I inflation.
Today, these are not valued as highly as military Lugers. If in very high % original finish, they are worth about $900-$1,000. If refinished, perhaps $600.
Marc
__________________
 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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