Pair Signed Crystal Glasses

Any suggestions on the signature?

 

I believe it's TIFFIN.

 

That is what thought but did the company use etched marks? By the way, only one of the pieces is marked.

 

I couldn't find a definite reference to Tiffin doing an acid etch mark, however, the way the mark is shaped is consistent with the Tiffin logo.

I think I was able to ID the pattern, it appears to be Chardonnay on stem 17683. If that isn't the pattern I think I have the shape right. If you agree, you might be able to ID it by limiting your search at Replacements to "Tiffin 17683" Your shape is called a Ice Tea.

http://www.replacements.com/webquote/tifcha.htm

 

... (the) Chardonnay pattern (was) produced between 1975-79. ..some are signed on the bottom with an acid etched Tiffin. (http://www.criffer.org/single-361738991033.html)

There's a photo of the etched Tiffin signature (photo #7) here:
http://picclick.co.uk/Elegant-Signed-Tiffin-Glass-Chardonnay-Cut-Champagne-Glasses-291982955102.html