The Krause catalog lists the 1 Schilling ( KM 523.1 ) at starting at $70.00 in very good condition and $140.00 in fine. This could be some heavy toning, but, looks as if it also has been cleaned as was your last coin. I'm not a grader on these either, not a specialty, but there are some G.B. fans here who might be able to help. Silver, but content and mintage figures are unknown.
I'll call it in the Fine range. Decent looking, but not problem free, as has been pointed out. Checking EBay's sold auctions might be your best bet, I would say $50-$75.
1711 had two busts, 3rd and 4th. Without checking I don`t know which bust is yours. These are the current catalogue values for each in GB£`s under British grading standards F, VF and EF Source Tony Clayton`s site. http://www.coins-of-the-uk.co.uk/values/onesh.html