Charatan records indicate the DC (Double Comfort) bit was introduced in the 50’s, but some report seeing them in earlier production. Still others indicate they were introduced by Lane in 1960. Regardless, the DC bit is not an accurate way to date a pipe because many Charatan’s were made with regular and saddle type bits throughout the “Lane Era”.
That's a gorgeous pipe! I do wish that someone would do a decent article on Charatan. It was a superb make and deserves better documentation than it's received.