That all depends on the year it was made and if it has any handling marks. NIB Belgians can run from $800 to $1800 depending. Jap A5 20's can run $600-$1500, it just depends on the marketing. You can also do your own investigation by looking at other models being sold that are in the same condition as yours. Try the gunbroker.com or a periodical called "The Gun List" You can also reference the Blue Book of Gun Values which can be purchased on line at various retailers
50-800 usd
100-1000 USD or so
You need the services of a professional appraiser
Value is too difficult to be accurate without seeing the gun. Recommend taking it to a gun shop for appraisal.
100-1000 USD or so
Assuming a Grade I Condition is important: NIB EXC V.G. Good Fair Poor 650 450 375 300 250 125 Belgian manufactured rifles are worth about 15% above these prices. Grade II and III are higher. $250 and up
Value of ANY firearm is based on exact make, model and condition. Your shotgun may be anywhere from $50 for a horrible specimen to about $700 for a NIB gun. You need a hands on appraisal.
A few thousand if NIB.
$NIB about $600.00+-
Depending where from 1,000 to 1,500.
nib $450
Condition is everything. NIB they can go for around 2K. Recommend you compare like Citoris on other gun sale websites like gunbroker or gunsamerica.com