Thanks dognose for the marks set. Now I'm even more confused over the Lion Passants of Newcastle. According to Jackson the date letter for 1787/88 (W) was used with the nipple bottomed Lion, not the rectangular one. Or perhaps they overlapped . Also what a wonderful "assay set" Sideways Lion, Upright Leopart (well whiskered) , Upright Town mark, sideways Duty and sideways dateletter.
What object was the mark applied to ?
Confused of Warwickshire