Rare MaCallan - Privately Bottled for Millennium

Hi,

I have a limited edition Macallan Matron's Millennium Malt, distilled in 1980, 18 year old which was privately distilled for the Nevis Estate (Sir Cameron Mackintosh) to mark the turning of the centuary. It comes in a presentation box, complete with 2 x etched tumblers. Does anyone have any idea of valuation or where I could get it valued?

Can send images to anyone interested.

Thanks.