About $250-$350, depending on EXACT condition, original box, papers, etc.
200 or so
100-300 or so
If your referring to the Beretta 21 in .25 auto, late model, no modifications, good condition. $275.00
0-400 USD depending on model, age, condition
$300-400, depending on condition and exact model.
Around $375, depending on exact model and condition.
$20-$100, depending on exact model and condition.
If you want an estimate of value then you will have to state the model and the condition of the pistol.
$150-$250, depending on exact model and condition.
Value depends on EXACT model and condition, but a pistol such as the Beretta Model 21 may be worth $125-200.
If your referring to the Beretta 21 in .25 auto, late model, no modifications, good condition. $275.00
serial numbers are of no value without the makers name, model of pistol, caliber and overall condition.....................