MacBeth-Evans 'Petalware' mustard

A $.79 thrift shop find today. It had no price tag so the cashier priced it. I have no idea what to call this thing, so no idea what to search for. My guess is it is for serving some kind of hors d'oeuvres, or maybe small fruits with seeds like cherries. Yes, I am outed, my culinary awakening took place in an Army mess hall. I have also been a vegetarian for many years, now, so seldom eat in restaurants. Any input is welcome. Made using a two piece mold, 4.5" in diameter and 2.5" high. High quality glass. No markings.