My 15-9 Heritage indeed has Doug Turnbulls logo stamped on grip frame. According to his website, they use "original bone pack method" of firearm refinishing. I've noticed no change in appearance after almost 1200 rds in the last month. Have used Hoppes #9, Wilson Combat bore cleaner and Breakfree. I suppose the colors may fade a little over time, like some Colt SAAs I have. So far so good though.