Quicksilver and Columbian Props

[scraver32]

I came across a bronze, 2 blade Quick Silver prop #48-28268A1 -17 and a Columbian prop that looks to be the same size as the Quick Silver but the hub is completely different. I found them in the rafters of my house so I have no information about where they came from.

Does anyone have any info on either of these two props (years manufactured, if they are still being used, etc.). Any info would be greatly appreciated.

Thanks!