There are 2 Percy McGregor trading cards tracked on HobbyCardIndex, spanning Hockey. The most valuable is the Percy McGregor #50 at $119.99 raw.

Source: HobbyCardIndex · Updated daily · https://hobbycardindex.com/players/percy-mcgregor

Percy McGregor Cards

Name: Percy McGregor Card Price Index — Historical Data
Creator: HobbyCardIndex
License: https://hobbycardindex.com/legal/terms

2 cards · Hockey

All Percy McGregor Cards