Yes, the bike has 531 straight gauge tubes in the main triangle. I bought this bike new in 1973 with lawn mowing money when I was 16. I had my dad drive me 100 miles to the nearest CCM dealer because I had read a rave review of a Mistral as a touring bike. The dealer said they had one and when I got there they didn't. They made me a nice deal on the Silver Ghost instead. It has sat around for a few decades. I got back into riding recently and bought a new bike. I am fixing this one up a bit to either ride for nostalgia sake or sell it.