OXO Oyster Knife
I was out of town, in possession of unshucked oysters, and had no oyster knife. One of my daughters went to Bed Bath and Beyond and found this OXO oyster knife. What struck me was that the blade was thin, pointed and curved just like the old knife my father made for me.
See here...

I really was surprised that the instructions said to use is as a prying knife. With the blade so thin I knew for sure I would snap it. Low and behold it performed just as the instructions said it would and it cut the knots perfectly. I did have to fight with it some on the really large oysters but over all it worked just fine.

Here are a few pictures.