Small glass jar, in good condition. It has a serial number, folded into the glass, reads as follows; 3 Regd number 539279 no idea what this is or what it was for, will post for free if it makes the buy now price. Also have no idea what it's worth, (if anything), so if price is unrealistic, make me an offer. (recently dug out of the ground on our new section, there was a shop on this site 50 years ago).