Herter's imported revolvers made by Sauer & Sohn in West Germany. Try http://www.e-gunparts.com for parts.
$100-$150
$100-$125
No published data.
Unaware of any published data.
Herters was an importer headquartered in Minnesota from the early 1960's to 1979. The guns they imported were of good quality but strictly valued as shooters. I'd suggest you check one of the chain sporting goods stores like Dicks or Garts or Gander Mountain for the cheapest NEW .22 revolver and figure yours is worth about 2/3 as much if it is like new, 1/2 if worn but functional or nothing if it's rusted and broken.
That 22 revolver is IJ targeted sealed made in Pittsburg, Ms.
5-50 usd
Impossible to answer without knowing who made it.
Small, inexpensive 22 LR revolver made in Germany.
A .22 revolver takes CARTRIDGES. Which .22 cartridge will depend on what caliber the revolver was made for. A .22 LR can shoot Long Rifle or Short cartridges, and a .22 WMR uses .22 magnum cartridges. They do not interchange. There are a few .22 revolvers that have 2 cylinders, and can shoot either cartridge.
S&w