Anglo concertina: Carroll
I ordered a C/G anglo concertina (small instrument) from Wally Carroll in October, 2015. I received it in April, 2018. So, the waiting time was about two and a half years.
Layout : Carroll layout
Bellows : 6 fold bellows
Ends : walnut burl ends
Keys : 30 brass keys
It's very responsive. I guess it's quicker than Suttner or Wakker though it's not quicker than Dipper.
I really enjoy playing it!