Stickpin Gold Bird Carrying Heart GG v 1738 Wolter 900 Gold Vintage Pin

Vintage stickpin, shaped like a bird carrying a dangling heart. The heart is engraved GG v 1738, the meaning of which is unknown. This pin is about 2.5 inches long, with the bird being about 1 inch wide. The back is marked Wolter 900. Possibly a reference to .900 gold purity though I do not know / actual metal content is unknown. This pin shows some overall surface wear/tarnishing, as shown in photos. Location: 167