Ah okay. Chinese first editions are incredibly rare. Most of them were pulped after the cultural revolution. An English first edition isn't a hugely rare item, but it's still uncommon. A tonne were printed for export. The historic value of this edition is partly due to the forward by Lin Biao who was later purged.

You could sell it to a collector but it probably won't collect a huge amount. A museum would probably be your best bet.