This jar holds two pints of water that fills it just below the upper rim, perhaps this is the equivalent of the the Stuart tankard argument i stepped into not so long ago. Whatever this is it's a great looking piece of glass, i'm no plant expert but does anyone recognise the flower on the side might that suggest it contained that specific plant seeds, is it an aquatic plant of some sort?, thanks for all your help it's been a fascinating read especially the old post Ivo put a link to on this thread from a previous GMB post, regards Chris.