If you post a photo I can try to identify them, but I anticipate they are an early Model 100. Is there a model marking on the cuffs? In any case, you did fine at $5.00. Most S&W cuffs on E-Bay go for $15.00 to $30.00 or so. The Model 94 cuffs (with a large tube type key) can go for up to $100. The other valuable model is the aluminum versions (Models 925 and 926) and these can easily be worth a $100.00 or more.

Hope this helps.

Steve