Glenn, Is yours new ,or old and made be Shine Mouton..
Have you looked at the reeds and sliders?

What is the center to center scale button to button and outside button to outside button, center to center ?

Is the bellows size Hohner HA 114 ? or something else ?

It's an early 90's Mouton.. hefty.. VERY LOUD.. ( louder than any Martin I've owned and played ... and the Bb helps ).. amazing woodwork..( it is literally unplayed )..
but felt my hands had shrunk slightly and it was weightier than most ( maybe because of the wood.. "long pine ? ".. dark and light combo.. very pretty.

Certainly feels like the most expensively made Cajun accordion I've played. I owned a CAJUN brand once ( the JR builder not Doucet ).. done in Some Hawaiian wood with amazing details, rounded buttons..etc. Which was impressive as well.

As far as saying one brand is better.. I thing an individual accordion can be better or better for one or more players.. but I've seen substantial variation in most major brands.. ( not bad to good )..just different.. which I think accounts for tastes..

G.

Hve you looked at the reeds and the sliders
Are the sliders aluminum ?