well it appears Sabbatini came into being in 2018 as a labor of
love by a father and son team... they had a pre-release catalog
online, and a website in 2019 (that was not renewed in 2021, and
is offline with the domain name available
SA might also be old Salpa marking ?
they are Voci Aramoniche now, i believe...
if there is an actual Sabbatini brand reed, perhaps it is just a
private brand... an individual can sit there with the proper tooling
and hand make a complete set of reeds from scratch, but honestly
you could probably count on one hand the number of people
still CAPABLE of doing this, much less has the time or the buyer
i seem to remember about 3 weeks is needed for a good reedmaker
to actually make a full set of reeds for a 4/5 full size accordion ?
Jim likely knows more about how much time it takes
individual hand done reedmaking is more like a man sitting at a
work station making A reeds all day, then tomorrow maybe making A#
reeds all day, while other ladies make C reeds or D reeds at other
workstations... they go into big boxes or drawers labelelled D, E, G etc.
when a set of reeds is assembled for sale, one of each of the needed
reeds is pulled, wrapped in wax paper and sent to the destination,
where they are finished and tuned and installed etc. to the degree
of finesse and time the accordion maker has to spare and honestly
i doubt any reedmaker ANYWHERE is actually hitting Rivets with a Hammer
one by one
and have any of you actually ever tried to DRILL A HOLE
in Spring Steel ?
Salpa reeds had the name "Salpa" stamped into some reeds, not SA. (I have worked on a few accordions with Salpa reeds.)
That does not bring us closer to what the stamp on the reeds in the photo means, but it rules out one possibility.