Terry-
Here is a link to the Washington State Sports Collectors Asociation website:
http://www.wsscaseattle.com The dates for the next show are given as Saturday, June 4 and Sunday, June 5. Not saying your grandfather's cards will turn up but there will be plenty of Obaks and Zeenuts and the like to root through, and there will be people who know a lot about old-time West Coast baseball (and who would be pleased to meet the grandson of an old PCLer).
I did a little clumsy googling and turned up these photos of the 1914 and 1915 Seattle Giants. The players aren't identified but maybe you can spot GrandDad. Copies can be ordered from the Seattle Museum of History & Industry. Contact info is on the webpage.
http://digitalcollections.lib.washin...smohai/id/6292
http://digitalcollections.lib.washin...smohai/id/5153
1914 Seattle
1915 Seattle
