UK Piano Page Piano Forum

Hi, I have been left a Grand Piano to sell for my Great Aunt, It has the name Collard & Collard on the front. There is also the name N. Heins. Hereford, Abergavenny and Brecon, Est 1830' How do i find out how old it is? The value of it? Are there any numbers stamped on it? if so, where do i look...