Now *this* one has a mighty interesting premise...a U-Boat Luger...Made me want to search a bit...
I found these:
http://uboat.net/wwi/fates/losses.html
http://uboat.net/wwi/boats/index.html?boat=11
<img border="0" alt="[bigbye]" title="" src="graemlins/xyxwave.gif" />