Roger Eubanks has done some fantastic work for me. Sent a barrel out to him and in 10 days had it back. Very fair price.
Doug Breaker the Gun Doctor in Minn. did my TMX about 6 years ago and it still looks beautiful. Bluing was part of a total rebuild.
I had my smith polish my TM1 and Turnbull did a very nice color case job on it. I don't know the longevity of the finish but i am careful how I handle it, especially when with sweaty hands.