Cute! Not sure you can see the small details, but there a tiny little pattern running around the top of the cup. Approx. 1/2" diameter x 3/8" tall.
Shown at left with one of the Simple Cup & Saucer Sets for scale.
One of these is included in the Alice in an Altoids Tin Kit.Bronze Teacup & Saucer Charms 160501SCT 160501LCB 150501AlcTinKit 160526RS 170524LM 160602SM 171015SC 160612LD 160908LM