I'm with patron -it looks like one of those guides or attachments that come with a tool, that you immediately toss in the drawer of tool attachments because most of the time it does not do exactly what you want it too, and you build your own jig, then, when you need it, for some reason you can only find all the other pieces of other tools…even the thing you are looking for-only the one that belongs with the broken one you used to have -and it won't work with the one you want it for.
I think A1jim is right with the fence extension, I think its used to cut a rabbet off the end of the fence. Why anyone would cut a rabbet this way is beyond me.
It is a hold down for a mortising attachment for a drill press. (at least that is what it looks like to me). OR a early version of what we use featherboards for now.
That looks like a fence,with a hold down for a mortising machine
Do you have a picture of the jointer?
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