Campbell’s “Nonpareil”? (serial number unknown)

System :Anglo
Maker :Other
Year: 0
Serial Number: unknown
Buttons: 20

Maker label is missing. But believed to be Campbell’s “Nonpareil” concertina (please see the 4th page of the catalogue http://www.concertina.com/eydmann/campbells-catalogue-1890.pdf ). C/G in old philharmonic pitch. 8 fold bellows. It has thumb operating levers on both sides to switch between single reed and double reed. In terms of construction method it is German.