The Bailie accordion was definitely around in the 70's, by which time there were already a few in the second hand market, looking as if they possibly dated from the 1960s
I looked some 4-voiced models over, with an intention to maybe buy one.
I remember being quite impressed with the attention to finish, including all interior surfaces, to a high standard of polish (some reputable Italian makes at the time being relatively rough, bare wood).
The sound was quite acceptable to my untutored ears.
In the end, I didn't buy one and later was deterred from Chinese makers by a DBA builder/accordion repairer because he claimed they were difficult to service, not sure exactly what the issue was
.
(To be fair, he also advised against German made instruments, for the same reason
)
When I raised this point with our "number one" repairman, I was given to understand that nothing, not even a German instrument was problematic for a master technician.
However, I did notice he was selling both kinds in his shop.
)
I see Bailies are still in the second -hand market at lowish asking prices.
I have no personal experience of any alleged issues but admit to a, probably entirely unfair, lingering distrust of both Chinese and German makes
.