I believe your vase is actually a piece of Bohemian Cameo glass produced using an Acid Cut Back technique by Kralik. The LCT signature is an obvious addition by someone. Tiffany signatures are almost always, with very few exceptions, in a counter clockwise direction..... In other words, written in the same direction, but below the pontil mark instead of above.....
Kralik ACB Cameo is generally found on a green or amethyst ground and is cut back from a Glatt Silberiris surface decor.... This is actually a pretty classic example of their style of work..... This would date to ca. 1900.
Very pretty example.....
Craig