Impossible to answer without a detailed description and condition.
50-160 or so
Heinz H. Schmidt has written: 'Die berufsta tige Mutter'
50-150 or so
100 or so
20-100 USD or so
depending on condition, around $250-$280
Richard H. Schmidt has written: 'How to mount fish' -- subject(s): Collection and preservation, Fishes, Taxidermy
$550-$750, depending on exact version, condition, etc.
These were not high dollar guns, but fairly well made. Value is around $150-$175.