Hi Folks, New member here. I’m trying to figure out the date of this Keiller Marmalade jar. I can’t find any similar ones online. From my research I discovered that the company was established in 1797 and became “James Keiller and Sons” in 1828. Does the fact that “and sons” is missing from my jar mean that it is an early jar... pre-1828? If so, is this rare? Collectable?