There exist many variants of Gage (Reine Claude) plums. They vary by ripening time, size, shape, skin color, etc., but most have a similar flavor type, very sweet and rich. July Green Gage (Reine Claude de Juillet), mentioned above, is important because it ripens very early, Old Green Gage (the original Reine Claude) is the classic one, Bavay is very productive and sweet. Some of the later ripening varieties, in addition to Bavay, are Golden Transparent Gage, Count Althann’s Gage (Reine Claude Conducta), Purple Gage (Reine Claude Violette), Jefferson, and Coe’s Golden Drop.
Measured brix values: Bavay — 28-32, Golden Transparent Gage — 31, Jefferson — 28, Purple Gage — 32, Count Althann’s Gage — 26, Coe’s Golden Drop — 23 (this one was likely underripe). All taste very good, so difficult to choose a favorite… Jefferson is very large, honey-sweet with delicate and mild flavor, Golden Transparent and Purple are intensely sweet and flavorful.