For fun - here are several different tuckers, you can see where the second on the left is very similar to the W9, The top left is the typical Greist design. Those on the right are all slightly different, mostly in the lettering on them.
These are four different rufflers.
And some different underbraider and shirr plates.
Not as much different in the binders/hemmers - though the older style has the multiple sizes that fit into a foot like the Greist still do today. Once Singer got the adjustable foot from WW, they stopped offering the multi size sets.
I've got three different types of Singer hemmer sets.