I recommend that you obtain a factory letter from Colt. This will tell you when and where it was shipped, and provide the original configuration (barrel length, type of grips, etc.). I also suggest that you carefully review the information available on this forum about .38-40 caliber Colt SAA revolvers. If you post some good quality photos, some of the experts who frequent this site may be able to tell you if it is in original condition or not, as well as its approximate value. Good luck learning more about your 1st Generation Colt SAA revolver.
Rusty Edwards