Anyone familiar with Anton Sandner guitars?

[Alter]

hi.. i just got this gypsy guitar used off the internet.. andon sandner is a german builder, i am unable to find anything more about him and his guitars. if anyone is familiar with this builder and the price range of his instruments i 'd greatly appreciate any input..

https://www.google.gr/search?q=anton...w=1252&bih=590



thanks in advance for any help