Tuning Hahn 45 Pistol restoration

I have a Hahn 45 BB pistol that I had when I was 12, and it is really in sad shape. I'm 74 now and would like to share the experience of shooting it with my grandson. Is there anyone who could restore this 60+ year old CO2 pistol and make it look and shoot like it was new? I am in Indiana, but I guess I can ship the pistol anywhere in the lower 48. If possible, I'd like the new finish to be Cerekote instead of black paint as it was originally......a lot of the paint is missing now.