Norwhich is for Norwich Glass Co. There was a Norwich Chemical Co as well...which could have had their products sold in these bottles... At any rate..
you have a KU-18. It's the tallest size for this group, but in the most common color. Value is around $1000 - $1200, depending on the day. The last one I saw on ebay started at $700, but I didnt see what it ended at. With label and contests, it usually will bring more than the plain bottle. It's a definite keeper.