10-50 USD or so
50
The gun is likely a Harrington & Richardson (H&R) model 925. The caliber is .38 Smith and Wesson (S&W) special, not to be confused with .38 special (SPL). You must shoot the .38 S&W ammo, not .38 spl.
The H and R revolvers, produced by Harrington & Richardson, include several models, with the most notable being the H&R Model 922, a .22 caliber revolver, and the H&R Model 929, a .22 caliber double-action revolver. Other models include the H&R Model 676 and Model 738, which are chambered in .38 Special and .357 Magnum, respectively. These revolvers are known for their reliability and affordability, making them popular choices for both target shooting and personal defense. H&R revolvers were manufactured from the early 20th century until the company ceased operations in the mid-1980s.
H&R model 949 was produced from 1960 to 1985.
H&R
The Young America model was introduced in about 1890 and remained in production until 1942.
No such caliber in that Model Number. Also, the serial number does not conform to the S&W convention. You might have an H&R Model 925
No such model number.
H&R made it
Your H R model 923 with a prefix of N indicates that it was made in the year 1953.
Value of any gun is based on make, model, and condition. There were dozens of different models of the H&R top break revolvers in .38 S&W- could be $50 or $250.