You must call S&W for an answer
H&R makes a 22lr 9 shot revolver, Model 904
Need the exact model number to help.
10-50 USD
A Colt peacemaker with that serial number was made in 1974.
Try e-gunparts.com
About 30-40 USD
No more than 50 USD
yes 22lr are ok.
$50-175, depending on condition.
No. The 649 was a 6 shot, and had two interchangable cylinders to permit the use of .22LR or .22 Magnum cartridges.
Economical 22 pistol
Never.