Just adding this link because of previous discussion on whether the height of the handle would preclude it being a linen smoother.
This is a linen smooth from the Corning Museum with a shorter handle and a pontil mark on the top of the handle. It is described thus:
'PRIMARY DESCRIPTION
Linen Smoother. Bottle glass, "black"; free-blown; heavy solid double-domed circular pad with large ball knob; pontil mark on top of knob; smooth flat base, very much worn from usage.'
and
'1800-1825 Willington Glass Works '
http://www.cmog.org/artwork/linen-smoother