Hi folks -- first time posting here. A bit of background. I'm new to the accordion, having never played one, but I've wanted to give it a go for a long time. In a bit of an impulse purchase, I picked up this accordion on Craigslist for $100 the other day.

It appears to be a Crucianelli, with the text "Crucianelli Sante Italia" inlaid on the front face, though it looks unlike any Crucianelli that I've seen online in my searching. On first blush, it appears to be in decent shape, but even to my untrained eyes, it's certainly not perfect. I'm relatively handy (and persistent) so I'm interested in restoring it to a more playable condition as best I can. I'm going to have a lot of questions, so apologies in advance! I opened it up and took some pictures, which hopefully help to illustrate some of my concerns.
First, the bellows appear to be in OK shape as far as I can tell? There are no obvious leaks that I can find.
Photos of the treble side:



And the bass side:


The guts of this were quite revealing in my opinion! The treble side in particular was interesting to me, as the craftsmanship appears a bit more ad-hoc than the bass side. So, a couple of "problems" that I've identified so far, with some questions -- excuse me for not knowing all the correct terms of art here
Video of treble keys "sticking":
In general, I'm just wondering what needs to be done to this to get it in good playable order.
Now, for some questions on how this thing is laid out. I've attempted to map it out manually -- see below for a crude diagram.

I can't find anything on http://www.korbo.com/piedcrow/DiagramIndex.htm that corresponds to this layout. The lower two treble rows look like G/C rows like here:

however with extra buttons at the beginning of the row. The top row doesn't seem to correspond to anything I could find on that site.
For the bass side, the lower (upper?) two rows are just the circle of fifths, with rows offset by a minor sixth, and the bottom two are major/minor chords in the circle of fifths. What would you call this layout? How would I go about learning how to play this? Is there some pedagogy/practice advice? Not necessarily particular to this layout, but just for the accordion in general?
Lastly, some questions about the origin of this instrument. Is this a "real" Crucianelli? Did I get ripped off paying $100 for something in this shape? When might this have been made? My intuition tells me that it's quite old, but I've got no clue.
Thanks a ton, and apologies for all the questions! Happy to provide more info if it would be helpful.

It appears to be a Crucianelli, with the text "Crucianelli Sante Italia" inlaid on the front face, though it looks unlike any Crucianelli that I've seen online in my searching. On first blush, it appears to be in decent shape, but even to my untrained eyes, it's certainly not perfect. I'm relatively handy (and persistent) so I'm interested in restoring it to a more playable condition as best I can. I'm going to have a lot of questions, so apologies in advance! I opened it up and took some pictures, which hopefully help to illustrate some of my concerns.
First, the bellows appear to be in OK shape as far as I can tell? There are no obvious leaks that I can find.
Photos of the treble side:



And the bass side:


The guts of this were quite revealing in my opinion! The treble side in particular was interesting to me, as the craftsmanship appears a bit more ad-hoc than the bass side. So, a couple of "problems" that I've identified so far, with some questions -- excuse me for not knowing all the correct terms of art here

- When pressing a key on the treble side sufficiently deeply, particularly on the second row, the "pad" will raise far enough so as to bump into the levers on the row above, lifting the lever up and allowing reeds to sound which ought not be sounding (See video 1 below). Is there an easy solution to this? Some mechanical means to prevent the levers to lift further than is necessary?
- Certain keys on the treble side feel quite "sticky", and have nonuniform resistance/actuation. Some even get outright stuck and refuse to return to their original position. It seems like there may be too much friction between the metal lever arm and the wooden "channels" that they pass through?
- The adhesive on many of the reed leathers has deteriorated, and many of the leathers have fallen off and were floating around in the bellows. Should I uniformly replace all the reed leathers with new ones?
- On the bass side, a small handful of notes will sound when no keys are depressed. Getting these to sound requires a decent amount of pressure applied to the bellows, however.
- On the bass side, some notes sound particularly out of tune. A good deal more of the reed leathers have fallen off on the bass side than the treble side -- I have read that missing reed leathers can affect tuning? Should I replace all the reed leathers before evaluating the intonation of the instrument?
Video of treble keys "sticking":
In general, I'm just wondering what needs to be done to this to get it in good playable order.
Now, for some questions on how this thing is laid out. I've attempted to map it out manually -- see below for a crude diagram.

I can't find anything on http://www.korbo.com/piedcrow/DiagramIndex.htm that corresponds to this layout. The lower two treble rows look like G/C rows like here:

however with extra buttons at the beginning of the row. The top row doesn't seem to correspond to anything I could find on that site.
For the bass side, the lower (upper?) two rows are just the circle of fifths, with rows offset by a minor sixth, and the bottom two are major/minor chords in the circle of fifths. What would you call this layout? How would I go about learning how to play this? Is there some pedagogy/practice advice? Not necessarily particular to this layout, but just for the accordion in general?
Lastly, some questions about the origin of this instrument. Is this a "real" Crucianelli? Did I get ripped off paying $100 for something in this shape? When might this have been made? My intuition tells me that it's quite old, but I've got no clue.
Thanks a ton, and apologies for all the questions! Happy to provide more info if it would be helpful.