H&R made thousands of revolvers.
r By calling S&W with the serial number.
50-150
Parts for an H and R Sportsman Top Break 9 shot 22 cal single action revolver can be found in many ways. The internet, especially gun websites, sell parts for different guns. Also, gun shops can provide certain parts for this type of gun. Calling in advance to find if parts are in stock would be best.
No more than 100 USD
50-125 or so
Best left to a gunsmith
Harrington and Richardson revolver chambered in 32 Smith and Wesson
10-100 usd
IIRC Cornell Publications might have an H&R book with sn.
H&R makes a 22lr 9 shot revolver, Model 904
25-100 USD or so. E-gunparts.com, want ads, gun shops, gun shows.