1920 luger ?
 

Looking for any info on this luger I have never owned 1 and not sure about this one and are they unit makings on strap

This appears to be a military Luger made before 1914 (indicated by the added hold open in the last photo). It has had the chamber date scrubbed but the 1920 property stamp remains, although the last digit is partially gone. The serial number on the receiver looks like it may have been over struck. It has been at least partially buffed, indicated by the soft edge below the trigger guard on the grip strap, and refinished (straw parts are black and there is no edge wear). The worn grips don't fit very well and may be from another gun. The J. R. unit mark on the grip strap may be Jäger Batallion Radfahrerkompanie.

The unit marking indicates 11th Infantry Regiment, 14th company, weapon number 47.

I disagree with much of the above. Your pistol began life in 1909 as a first issue German military purchase without stock lug, hold open (which was later added) or chamber date. The 1920 marking on the chamber, indicates that it was still in military custody in 1920 and was counted as one of the 100K firearm allowed the post Versallies Treaty German military. If you look closely, you can make out the faint inspector's marking under the serial on the left side of the receiver, which was the correct placement prior to 1910. Marked on front grip strap upon receipt by the 11th Infantry Regiment, company #14, log in #47. TH

Early military pistol, 1913 or before (1913 was the transition year and had both stock lugs and no stock lugs) as Karl says. The 1920 is a Wiemar Republic property stamp; not a date.

WRT the unit marking, I'd say it's "11th Infantry Regiment, 14th Company, 47th weapon". The Germans did not use the letter "I" as the I & J are interchangeable in their alphabet and they used "J" for Infantry.

(While I was typing - one finger - both George and Tom replied. I agree with them.)

Can anyone give a value as I may purchase this weapon but not very knowledgeable on the luger

I would not pay more than $800-1000 for a luger in that condition, due to the refinish and non original condition(serial number added to left chamber). It is or could be a shooter with interesting unit marking- but that is assuming it shoots and has a reasonable bore.
Better yet, study the posts and info here, and actual selling prices on line before you buy your first luger.

answered on facebook - asked if matching - seems refinished - so priced less than $800 to me