We bought a C/G Connor concertina (Jeffries copy) from a Japanese accordion player in 2015. He had bought it from John Connor in 2010.
Layout : Jeffries layout
Bellows : 6 fold bellows
Ends : Flat metal ends
Keys : 31 metal keys
Reedpan : Parallel reedpan
It looked nice, but it had some reeds which were slow to speak. Although I could adjust several reeds, I couldn't fix some reeds. So, I sold it to a repairer who lives in U. K.
"Connor concertinas can be very good or not so good-probably depending on when they were made."
"Connor reeds are way bigger than other concertinas-at least the frames are."