U-1956 (https://www.nia.org/general/pifous/text/u1956.htm) with a brass fuse holder with the letter K stamped on the head, I can't find the manufacturer or information about this type of logo. It has a small damage with loss of porcelain as shown in the photo. "Made in Poland" is stamped on one of the fuse holders. $48 including US shipping. PayPal.