Originally Posted by
sd5782
...Two compact 6s have 3.5-4mm to the sprocket.
Compact 6 on perfect body I think
Compact 6 on pro Compe body
Just a few data points for anyone interested.
I'm certain the top picture is of a regular spaced Suntour Perfect 6-speed. The lower picture is definitely of the Ultra or compact spaced Suntour ProCompe 6-speed. Perfect and ProCompe bodies share the same dimensions and there are three different bodies for each of the three configurations.
The key give-away is the difference in the flange height from the top of the outer bearing race/retaining ring to the top face of the smallest sprocket. Your picture clearly shows the difference.