This appears to be a single disc opener type of seed drill, which makes it ....... old. It used to be longer, but has been cut down.
Seed box is pretty rusty inside which (to me) means it hasn't been used in a while and not maintained. I don't see where the "adjuster" is, to vary the amount of seed so that you can seed wheat, or oats or rye or beans or ...... That is kind of important, to make sure you get your desired seeds per acre and you will only use this for large seeds.
To use this, you will spread your fertilizer, work the ground, use this planter, then run a cultipacker over it or a drag, broadcast your small seeds and then use the cultipacker/drag again.
I think I would keep looking or invest in something like a Herd Seeder https://www.easyattachments.com/Herd-M-12-3-Point-Hitch-Broadcast-Seeder-Spreader-p/m-12.htm
which will spread your fertilizer, large seeds and small seeds and buy or build a cultipacker. https://www.everythingattachments.com/Tractor-3-Point-Hitch-Cultipacker-s/70.htm
My M-12 (aka M-96) is 11 years old and gets washed, greased and oiled after every use. Spread your fertilizer, spread your large seeds, work the ground (or not), cultipack/drag, spread your small seeds and cultipack/drag again
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