Originally Posted by mswantak
The base Sports model came with the mattress saddle, the Deluxe had the B72, and Superbes the B66.
S22, DL22 and DL24, respectively.
That all-chrome variant seems to be a S22 then, for the saddle it has upon it is the correct mattress saddle for that year (and was slightly modified in '70).
Take care,
-Kurt