Off-topic I'm afraid but it's to do with 6,900 yards: Growing up watching The Open, it was always noticeable that every course on the rota was around the 6,900 yard mark... Carnoustie (which was off the rota from '75 to '99) was supposed to be the beast at 7,200 yards (although I'm not sure it was really played that far back in 1975)...
In fact, I think the Open courses sat at about 6,900 yards for 40 or more years... It would probably make a good analysis of equipment changes to track a trend of Open championship lengths... There will be a few step jumps at all the expected places...
I'm not sure what they played from in 1905 though...