I noticed my model 29-3 unfortunately had a plum colored barrel when I bought it last year.
The price was right and its not a show piece but a shooter. (Although it is in excellent condition).
What can I say?....Im Plum Crazy.
BTW, in ordinary incandescent light it is virtually unnoticeable.
Some bright lights and flash photography bring it out.

Here are a few shots of the same gun , It really shows in some. Others not so much.
They were all taken with the same camera on different days with different backgrounds.
It is all a mystery to me.
Cheers