Bobby Orr's Rarest Jersey?

Game worn jersey hounds strive to add the rarest of finds to their collection. Classic Auctions.net is currently offering what might be the rarest Bobby Orr jersey ever:

That is a Team Canada practice jersey from the 1972 Summit Series. Due to knee surgery, Orr was never able to play against the Soviets in that most famous of all international clashes. He did participate in pre-series practices in hopes he could play. Researchers were able to uncover photographic proof to authenticate this as Orr's only jersey from the 1972 Summit Series.

The jersey has been in the possession of the late John Ferguson, who was Canada's assistant coach in 1972. It is already fetching huge interest in Classic Auctions.net's "A Century Of Memories" auction.