Can't be answered without a DETAILED description of ALL markings, finish, overall condition, box, papers, accessories, etc..
Only what someone is willing to pay !
No way to answer without a serial number and complete description
$50-$75
No known sn data; 50 USD
35-100 USD or so
About $450, depending on condition.
25-50 dollars
Impossible to answer without knowing the model and who made it.
$50-$75
41 or 42 ? about 350 $
10-30 usd
10-30 usd