NOTE: Karen Welch 2023: from an undated McKee catalog, but the catalog contains Fentec which was introduced in 1907 and wouldn't date any later than about 1910 as it is a pressed blank catalog. McKee was sued by Fry and had to stop marketing pressed blanks, so I believe the catalog dates somewhere between 1907-1910. later reproduced by LE Smith and is known in at least two colors, green and gold/amber.