vintage double ended glass jar zinc lids

We are offering for your consideration a vintage glass coffee grinder jar. This jar is a hexagon (6 sides) with a round opening at each end. It has standard zinc mason lids on each end. It is seven inches high. about 4 1/2 inches in diameter. It is in excellent condition. The Jar has embossed in the glass 'Patent applied for'. It appears to be very old.