I have two of those Lions and they are Westmoreland. However the mould for the first ones made, by who I don't know, were in the 1800 date on the piece. They were reproduced by Westmoreland in the 70's I believe.
HI, I BELIEVE THE TOP U HAVE WAS MADE BY IMPERIAL GLASS AND THE BOTTOM BY WESTMORELAND GLASS BOTH COMPANIES COPIED THIS ITEM AND PRODUCED THEM AT THE SAME TIME. TERRY