Egg glass made as "cheating glass"

Height 15 cm. There has been a long tradition that glassmakers after working hours and in breaks have been able to produce things from the residue left in the glass oven. These things are called cheating glass and are usually coarser in their lines than the regular production. If this glass has been intended to drink or use for eggs is unknown. It has a rough "sand nail" underneath and several blisters in the glass, indicating it is before 1900. Item number: 2939