Well, what a huge surprise! I have some family bits and pieces - Simons family, located (sequentially) Chester-le-Street, Co Durham; Llanelli and Carmarthen, Carmarthenshire; and Merthyr Tydfil, Glamorganshire, with just this crest and motto. I've just, by idly searching, found items on an auction site: see http://www.aspireauctions.com/auction297/details/35799.htmlhttp://www.aspireauctions.com/auction297/details/35799.html Would be fascinated to know if this matched yours. I think I'm right in thinking that the Stockdale line is from NW England?
My email graham dot simons at pangcoll dot co dot uk if you want to contact directly.