Value of an Item... Any antiquarian item's value is determined by someone who WANTS IT, and is willing and able to pay an AGREED PRICE, to OWN the item and therefore determining at that moment, at least one market value. Duncan McLaren, LDRB Determing the fair market value is as much an art as it is a science, especially today in the world wide web of many more options, choices, sellers and yes even buyers. What are you thoughts on this? Let me know by contacting me at 905 680-8115 or email me. We continue learn and improve by communicating. We are constantly challenged on this topic from listing our items for sale to providing evaluations, appraisals for institutions or individuals and taking on items for consignment.