TREASURE I say! Redbook only lists the base-embossed version, and that is $75 -$100. I've never figured out why they're valued so high, but if that's what the market will bear.... Anyway, that's base embossed, and I've never seen one with embossing on the shoulder - should be quite a prize. One more thing - the Speas have been reproduced, so you have to be pretty careful when buying - you don't want to pay a lot for a Chinese repro. Greg Spurgeon's guides might be helpful: http://reviews.ebay.com/More-Fake-Speas-Jars-Half-Gallon-Size?ugid=10000000004106519
That jar pictured in the link was a quart, I remember there being a post regarding these jars a few months back regarding their value. They do seem somewhat available when looking at Ebay, and there's nothing much in the way of appeal visually so I'm baffled, best of puck with it MM...[]