Yes
A .38 Special round is compatible with a .357 revolver because the .357 revolver is designed to shoot both .357 Magnum and .38 Special ammunition. The .38 Special round is slightly shorter than the .357 Magnum round, but it can be safely fired in a .357 revolver without any issues.
It is the round with which the revolver was "proof fired" at the factory to test its functionality.
A revolver with a 6 round capacity.
NO
If it is the correct one, yes.
The portion of a revolver that holds cartridges as they are fired is the cylinder.
5-8
I can load my charter arms bulldog pug 5 round .44 special revolver in 6 seconds without a speed loader.
The exact value of an HS 22 8 shot revolver from Germany is actually highly dependent upon a number of factors. Some of these factors include the age and condition of the revolver.
50-150 USD or so
It depends on what you mean. A .38 revolver may be a .38 special, but there are other types of .38 besides just the special round.
Only if it's a .22 Long Rifle revolver. It's not compatible with the .22 Winchester Magnum Rimfire.