well, if you remove the cone-cap that with two holes (that is loosen in clockwise direction like the arrow says) you will probably find:
2pawls
2springs for each pawl
around 100 3.175mm balls on two raceways
1-2-3 shims that can be removed in order to tighten the bearing as it wears out.

So do this over a BUCKET or a large tray to collect all of these.
Put the wheel horizontal and slowly lift the cone/cap, there you can see the balls and a part of the ratcheting mechanism.
Then put the wheel over the bucket, and slowly lift the cogs. Some balls will fall from the raceway, some will stick to the raceway of the cogs part (and the balls will fall at a slight movement, eventual into the bucket)
Study a bit how the pawls and springs are attached and remove them (first the springs then the pawls, usually on older freewheels it has individual springs like a paperclip, or like a floppy disk spring (that that holds the lid closed), or even a block of rubber to act as a spring (rarely). Anyway, remember how it was attached.

Remove all the balls and pawls and clean with a rag/gasoline/diesel/alcohol/or whatever to see the actual state of wear.
Inspect the raceway, the fixture of the pawls (if a ball was fractured it can easily get in the pawl assembly and make havoc in it like broken pawls, broken springs, and even broken fixture of the pawl it has a slot-groove-hole thing to fit in that can be cracked.

Also at this moment you can see if it's a removable freewheel (as a whole with the one way mechanism), or if it's from the same body of the hub. As I said I actually have two hubs, both of them with 4 gears from 71-73 around there (russian made), so it's not uncommon to have a non-removable freewheel, but if you can, post some pictures when you dismantle it.

Or better yet try post a picture from behind, a picture from the other side, to see the joining part between the largest cog and the fixed part of the hub.