40's and 50's
Try e-gunparts.com
25-100
Your harrington and richardson model 900 was made between the years 1962-1973.
not sure, but I thinks it's a 22 cal...............
No such maker. However, there is a firm called Harrington and Richardson and they did make pistols in 38.
10-100 USD or so
25-125 USD or so
100 USD or so
The Model 765 Pioneer bolt action .22 rim fire rifle was in production from 1948 to 1952. It is not considered rare nor scarce. Value will vary depending upon condition. Excellent $175 down to fair $75.
50-125 or so
One of many models made by H&R