Join Date: Feb 2010
Location: SE Penna., USA
Bikes: Santana Cabrio triplet, Santana Fusion S&S tandem, Co-Motion Mocha S&S tandem, Co-Motion Pangea S&S, Co-Motion Nor'wester S&S, C'dale F2000
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My guess is that is actually a 8-9-10 speed compatible hub. I don't think Hadley made hubs for Santana that far back. Most likely a replacement wheel, and a nice one at that! I have four sets of wheels for my Santanas, all with Hadley hubs. Never had a problem, and the ease of disassembly with just a 5mm Allen wrench is great (just like Phil Wood uses). From your photo, it appears that there is a spacer between your seven-speed cassette and the back of the freehub. This is used when you run a seven-speed cassette on a newer freehub body. Just remove the spacer and you should be good to go with a newer cassette. If you use a 9-speed cassette you won't even have to change your shifter from the sounds of it.
BTW, the black thing on the left side of your hub is a thread-on/off cover that covers the threads for a drum brake (or disc brake with adaptor).