Thrift - Blue Heller Mug

Stopped by the thrift store. Picked up a pair of Lillian Vernon 1984 Season's tiles. SOLD

Three yards of 'Covington Fabrics 5th Avenue Design' circa 1960-80's. My cousin recognized the teal Heller mug and picked it up for me - good eye! And a small 925 silver and Lapis horse pin that I thought was from Mexico but is most likely Turkoman tribal jewelery. How do I find out if it's an older piece as they are worth much more? SOLD