Manus Nienaber

Good day, I am new on here and have a Wheatstone concertina for sale. It was my grandfathers and I cannot play. The serial no is 55804. It was redone around 50 years ago when I was a kid and the book had two extra partitions added for more air volume. There are three screws out on the left and one on the right side... it still sounds great. I am in South Africa. I am looking to get €2500 for it if anyone is interested. I can send more pics should you require additional photos.