Reckenpfennig of Nürnberg made by Hans Krauwinckel (or his son by the same name) http://coinquest.com/cgi-bin/cq/coins?main_coin=15890
Yes - known in the UK generically as Jettons. Used as tallies to help the innumerate to calculate market bills etc. They are fairly common here - regularly found by Metal-detectorists particularly on old market sites. I believe mostly 16th century though others may correct me on this.
