The stamp was later replaced by Tiffany’s initials, which is one way collectors are able to determine the approximate date that a Tiffany Favrile lamp or other glass item was made.

该邮票其后改为蒂凡尼的缩，一种方法能让收藏家能蒂凡尼的法夫莱尔灯或其他玻璃项目的大约日期。