Hi Bruce and welcome to the forum!
Looks like a very desirable Police rig.
You can get an idea of retail values by looking at Simpson Ltd's website and at sites like FGS Firearms and check point charlies.
Simpson Ltd
FGS Firearms
Check Point Charlies
Look for similar Police Luger rigs.
You will need to determine if it is all matching, and the numbers on the magazines.
Marc
__________________
Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.