Yes looking at the history of the Accordion makers it seems many changed hands and were absorbed by others.
The name Settimo is typo on the site presumably.
The quality and skills of the makers hopefully doent get lost, by this process.
The tonal quality must be lost surely by modernising the materials and methods of assembly, only those with an ear for this will probably notice it the greatest.
The actual player will notice its ease of use, smoothness of action and response to the player needs.
Also the cost for the quality accordion must be greatest for those traditional built which provide the better tone and overall sound.
Who makes the best reeds, would be my question. If you need a replacement to keep the quality on a good instrument, would it be a best getting proffessional work done, by those preferably who made it, or have trained by them. I would asume so. To salvage a reed and try to install on an expensive instrument, would maybe be an insult to the people who made it, but most importantly not keeping the high quality and best sound expected of the instrument. Or is it that a better quality reed from a traditional made instrument would increase the quality of sound in one of the modern, cheaper instruments.?
The reeds themselves have to be an important critical part of this musical instrument, as they initially produce the sound.
What determines a quality reed ? the initail make of the metal, the treatment as from the website -http://www.advantagefabricatedmetals.com/metalformingglossary.html
Accordion reed steel
Hardened, tempered, polished and blued or yellow flat steel with dressed edges and a carbon content of about 1.00%. Material has to possess good flatness, uniform hardness and high elasticity.
just read this website, his way of tuning and repairing old reeds.
http://1accordion.net/tuning.html