gtsport
Elite Cafe Member
They say it is some kind of engraving tool, looks like some kind of inline tracer to me.
http://www.ebay.com/itm/VTG-BRASS-J...340727?hash=item5d73e4eaf7:g:MAYAAOSwvT5Zf~58
http://www.ebay.com/itm/VTG-BRASS-J...340727?hash=item5d73e4eaf7:g:MAYAAOSwvT5Zf~58