Anyone know about Gustav Wasmer upright piano ?

[larad]

Hi
My parents have an old upright piano - Gustav Wasmer, Berlin.

They bought it about thirty years ago and it is at least 130 years old (they were told it was about 100 years old when they bought it).

They want to sell it as they are moving so I want to try and work out what it might be worth, if anything at all.

Thanks
lara
South Australia