Welcome to Watchuseek! I am sorry but I am also finding very little. "Rival" was no watch company, it was a brand (rather like Mercedes is a brand of the company Daimler-Benz). Unfortunately, there were several "Rival" brands and I can't find a match for "Rival" in a rhombus. Probably the most notable "Rival" was registered by Buren Watch Co., another by the french company Lip and Elgin seems to have had one too. All I can say is that I can find two more specimens with that movement but in neither case do we find any indication as to the true maker.....
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