Not exactly ancient, but I bought this at about double retail value at a California coin show, paying $70 for a $30 coin. I wanted it because it is from my original home region, but I wasn't really knowledgeable about the price point of early modern German silver fractions. In the end, this was a rather cheap lesson on always knowing the coin or quickly comparing prices before buying. Duchy of Schleswig-Holstein Gottorp, under Christian Albrecht, AR 1/16 taler (düttchen), 1670 AD, Schleswig mint, Obv: * CHRIST . ALB . DG . H . N . D . S . & . H; bust of Christian Albrecht r. Rev: PER . ASPERA . AD . ASTRA . 1670 .; XVI / REICHS /./ THAL.; .C*P. (for moneyer Christian Pfahler). 19mm, 1.68g. Ref: Lange 389.