Hi bochobolso71,
First of all, I don't think the bass you are holding is actually a Kramer. It looks to me like a Kramer Aero Star bass neck bolted to what appears to be a Squire P bass body.
Here is a picture of an Aero Star neck:
 
Here is a picture of a Squire P bass body:
 
Anyway, the bass is not worth very much money. I would guess $50 to $75 USD assumming it plays reasonably well. sb