Centennial Flouring Mills issued these Seattle Rainiers team sets in 1943, 1944, 1945, and 1947. The 1947 issue is much easier find than the others (1943/44 being the most difficult). This regional issue has limited appeal so the cards are not expensive. I tracked all of the eBay sales from 1985 to 1988, and the 1947 cards average selling price was around $25.
Cool cards for PCL collector though, especially Seattle Rainiers collectors. It is one of the few card sets issued during the WW2 years.
The front and back designs changed a little from year-to-year. Old Cardboard has a representative from each year:
http://www.oldcardboard.com/f/flour/...cardsetid=1002