Could be HS, Rohm
Probably Herbert Schmidt
$25-$75. These were low cost firearms of indifferent quality.
@ 50 USD.
10-100 uSD
Not sure. I just paid 65$ for mine, and it's good shape, the grips are not cracked, and the blue is mostly there. Mine is a Omega HS-400 22LR made in Germany 8 shot with a 2.5 inch barrel.
10-60 USD or so
50 or so
10-100 USD or more depending on specifics
It depends on the generation and condition...
10-100 usd
he does not need a booster...they have found that one shot works