In order to answer your question correctly,I would need you to Identify your Smith and Wesson airweight pistol more.I would need the model number and serial number along with the overall condition of your firearm to give you a accurate value to your question.
50-500 usd
50-500 uSD
$20
Informaiton not available in the public domain.
Military and Police
50-475 usd
100-450 USD
1982
You need to find a gunsmith or firearms instructor
about $500 New in box.
50-350 usd
Smith and Wesson is the make.