It is a vertical sundial and you may buy it on Ebay for only 2 euro ! See in
http://cgi.ebay.it/2-Cadrans-Calendriers-Solaires-Medaillons-en-Bronze_W0QQitemZ370180087988QQcmdZViewItemQQptZFR_JG_Collections_Sciences?hash=item370180087988&_trksid=p3286.c0.m14&_trkparms=72%3A758%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318#ebayphotohosting I have bought one time ago. Bill has already explained how to read the time. In the model sold there is also a little pin to insert in the hole in the center of the star. People in France can adjust the hour read with the correction written on the rear side of the disk Best wishes Gianni Ferrari
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