I just purchased a heavy zuni inlay with a dancer
TT hallmark on back
Wonder if you know hallmark TT

I did a internet search and came up with this quote: "The TT is the hallmark for The Tobe Turpen Shop" I found this info at this website address: 407M - EAGLE ROCK TRADING POST (http://www.eaglerocktradingpost.com/407m.htm) I saw a piece of jewelry there with this trademark: H. Morgan - TT . Note: I did a little more research and found this website that has a directory of different Indian Hallmarks:
http://www.art-amerindien.com/signature_indian_native_marks_mz.htm#t
I saw a TT listed looks like two of them. One name was Chris Tom -TT and the other was Thomas Tso. What is nice about this directory is that it shows an actual photo of the hallmarks. Hope that helps you out.