Vintage (set of 4) 6 oz. Custard Cups in Smoke Brown Glass

Vintage (set of 4) 6 oz. custard cups in smoke brown glass. Ramekins are in good vintage condition with no chips, cracks, or damage, but there are some scratches from previous use which is to be expected given their age. I’m unsure if they’re Pyrex since I can’t see any maker’s mark. Please refer to photos for item condition.