YVES ROCHER VINTAGE GOLD PLATED LADIES MODERNIST SPIRAL PIN BROOCH MARKED YR 

Swirl brooch. Gold tone alloy. 5 cm. 1970s

Yves Rocher was one of the most famous cosmetic companies.  His company started creating jewelry in the 1970's.  And the YR mark was sold in boutiques.  These pieces of jewelry were given out as a gift when you purchased cosmetics from the stores.  They were given out in a box or Velvet bags to the customers. 
This brooch/pin measures 1 7/8 inches long x 2 inches tall