the International Rollei Club

My father-in-law has asked me to sell some of his camera equipment on ebay. He has a Rolleiflex 2.8F K7F and has said that he thinks it should be listed for £2,000 - £3,000. It is in mint condition in it's original brown leather case. My problem is that this is a VERY wide price range and we're both not clear on what I should actually list it for to get the best price for him, but also be fair to the buyer.

Honest advice would be gratefully welcomed.
Thank you