Stradavarius

[stradanno17]

I've been given a Stradavarius with case and 3 bows, inside is says:

Antonis Stradivarius Cremonensis
Faeiebat  anno 17                                    AS(in a circle, a small cross is between the AS toward the top of the letters)


Made in Checkoslovokia

I'm looking for approx. value and how to contact private collectors?

Thank You for you time.