It isn’t super old but it is old enough that it is missing words like “computer”.
Either of these gals. One is a dado1 plane by Christopher Gabriel (1746-1809), who was a plane maker in London in the late 1700s, early 1800s. The other is a skew rebate2 plane by Fitkin, also British plane maker in the late 1700s, early 1800s.
I don't really use the dado plane, I restored it to fine working order, but I don't do a lot of stuff with dados for one, and for two because the plane is extremely unpleasant to hold on account of the depth stop adjuster digging in your hand when you use it, and it requiring too much force in harder woods like beech.
The skew rebate I had to plane the sole flat and fence straight, which was a bit of a nailbiter, modifying such an old tool, but it's come out very nice, and this is the plane I pull out when I need some regular rebates done. (It doesn't have or ever had a cross-grain knicker so using it cross-grain isn't the best idea.)
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A dado is a groove specifically across the grain, like you'd might see used for a shelf.
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A rebate, or rabbet, is a step on the edge of a board. Often found on the back of cabinets where back boards can be nailed in invisibly. The skewed iron here allows for a cleaner result planing against the grain because its skew produces more of a slicing action.
