A plethora of pegs

or: what am I looking at, here?

This little wheel is possibly the most well-pegged wheel I have ever seen. The legs are pegged in (straight, or slanting, into the table, so no way to get them out), the uprights too. The MOA is, of course, pegged in place. The back maiden has a slanting peg to secure it to the MOA. Both leathers are pegged in place, through the maidens - the back one with a slanting peg.

All the spokes are pegged to (through) the wheel rim, of course.

BUT: there is one oddity: the secondary uprights are NOT pegged, neither at the top (just inserted in slanting holes), nor at the bottom, where they instead are nailed, with metal nails.

Uprights and front leg pegged from the side:

One of the two nails present:

MOA and maidens:

Drive wheel - rim joins are pegged from the side, spokes through the rim (no "seating holes" for the spokes into the outer rim):

Treadle:

There are bearings for the wheel, too. Guess what - they are pegged in place:

So: what am I looking at, here? Is this an exercise piece?
First, all the pegs. Not only the number, but so many of them are slanting! It is natural to "secure" the leathers, but with slanting pegs through the maidens? (The orifice leather is sewn, though I have seen pegged ones before) The front maiden once had a nut, now lost.
Next, the table decorations. Rather a lot of work, on a piece of wood with a knot almost in the middle of the decoration? And with several (what-do-you-call-it? "help lines"?) showing? (There is one more knot at the back end of the table, too, making three knots showing on top of the table). All "ends" are notched, front and back of the table, front and back of the hole for the tensioning block.

Then there are two (at least) different woods: the wheel rim, the foot plate and the nut under the MOA appears to be oak, while the rest appears to be birch, the table possibly pine. (In my experience, birch is the most common wood for Swedish spinning wheels - and they are usually one wood only).
Looking at the MOA nut, oak doesn't look ideal for making threads; the nut looks kind of "sad" - it is obviously A Good Thing this nut is not very often used.
Also the wheel bearings: thicker than usual, u-shape with "wings" fitted into the upright. They are only half of the upright's width, made of brass.
All these oddities makes me think this may be a practice piece - it is not, IMO, good enough to be a (again, what is the word here?) journeyman's qualifying piece - if, for nothing else, the two very visible knots in the table. But is HAS a maker's mark...

Oh, and it spins nicely. It is my first with a sliding hook.

(Should I add: click images to biggify?)