The H&R Model 903 was listed to sell at $149.50 back in 1983. The revolvers in this series(903, 904,905) were adjustable sight revolvers of good quality for a low price. If you have one in good condition, and you enjoy shooting it, keep it. THere is little collector interest in these guns. If you want to date this gun, check this site for lots of information on H&R's from the guy who is writing the book.
www.armscollectors.com/faq.htm
Follow the directions for the H&R forum.
Enjoy your gun.
Mark