Vintage Corocraft Sterling Silver Vermeil Flower Brooch Pin Unusual Signature

  

Early Corocraft Vermeil Sterling Silver Flower Brooch. The signature is different then any others I have seen but I'm sure the collectors know what it is. In front of Sterling is either a P or R, then there is Sterling and it looks like craft the Coro. I tried to get the best pictures possible but it is hard to see. Doesn't look like there is much tarnish at all.