Can't find anything on an Astore S. Maybe an Astore 5? Seems to fit your description. They don't show up very often on the used market. Couple references indicate somewhere in the $2,000 range, 98% condition. I think the Astore S was Italian-made, although the lower grade Astores were made in Spain. If it's Italian, you should be able to find a date code--either Roman numeral or two letters--by which you can determine the gun's age.