The big fuzzy pictures are not a great help.
Close clear pictures will let us help you know what you have.
If the barrel is original - there are some little fine markings that will show - then the gun is worth a good bit of money even with the finish pretty much gone. When new it had a better blue job than most of the new guns on the market now.
The gun is made of mild steel not heat treated.
If you crack the slide plinking with it, you can watch several thousand dollars of resale value go down the drain.
The wear marks on the barrel show it has already been shot a good deal.
Do not store it in the holster, that is probably where most of the finish went.
Read up at
http://www.coolgunsite.com/