Kerr 1/2 gallon fruit jar, Sand Springs Okla, 1915.

This is an old Kerr self sealing Mason jar. On the bottom of the jar it says: 1915 Kerr Glass MFG Co, Sand Springs, Okla. PAT. AUG 31 1915. The jar has a darkened tint where it has started to turn purple with age, and also a few bubbles. Zinc lid. Excellent condition with no chips or cracks.