I went to
Oldguns.net and was sent this reply:
Greetings Jack,
Thanks for contacting OldGuns.net. H&R has offered 2 different
Sportsman models. The first Sportsman (Model 199) was a hinged-frame revolver
that was introduced in the late 1920s. Revolvers were available in
either single-action or double-action configuration. The Original design
was intended to be used as a Target revolver, it duplicated the grip,
size and balance of the USRA target pistol. Five interchangeable grip
styles were offered, and the trigger guard had a spur behind it which
filled the gap between guard and grip to give a solid rest for the
shooter's second finger. One interesting safety feature of this model is that
the rear face of the nine-shot cylinder was recessed around the
chambers, leaving a solid ring of steel around the outside of the cartridge
rims to prevent metal splash should there be a case-head failure.
Your revolver sounds like a Sportsman (Model 999) second issue. This 9
shot revolver had a vented rib barrel, top-break action, adjustable
sights and walnut grips. Revolvers were available with a choice of 4 or 6
in barrels. Second issue revolvers were manufactured from 1950 to 1985.
The "L" part of your serial number is a date code which tells us that
it was manufactured in 1951. There is not a lot of collector interested
in H&R revolvers values usually fall in the $150 or less range.
Let me know if this helps.