Information about this plane?

[roger wiegand]

I wonder if anyone can tell me anything about this plane? It seems to be a fairly sophisticated plane for cutting grooves or rabbets. It has a double pointed nicker ahead of the blade and a screw-adjustable depth gauge. I don't see any markings or an indication of a maker on it. It was just given to me, I'd be curious as to age, who made it and proper use.

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[Rafael Herrera]

It's a dado plane.

[Jim Koepke]

It's a dado plane.

Yep, I have a few in different sizes.

mine tend to have the lower parts centered on the body instead of to one side like yours.

jtk