hi, welcome to the board.

I'm afraid I know nothing about Tiffin - I presume that's an American company?
Glasses can be very difficult to ascribe to a maker (unless they're marked) and they were (obviously) made in all sorts of places for long periods of time.
However, we do have American glass experts here - they just don't pop in every day, you may have to be patient until the right person comes along and sees them.

I'm afraid I can't make out much detail from your pics, sadly. They don't enlarge very much and there is a lot of stuff going on in the background, it is better to take pics against a plain white or black background - a sheet of A4 would do.
There is a whole load of techie info here about posting images directly to the board (clicking on your images took me somewhere else I wasn't sure about, so I hastily undid it, I'm suspicious of sites I'm not familiar with, and I'm not very techie myself.)
Hope you get some more useful help soon.
http://www.glassmessages.com/index.php/board,22.0.html