Parked up on the ramp at Renton was what appeared to me to be a de Havilland Canada Beaver on floats. However, it looked different to every other Beaver I have seen. This one seemed to have a fun that was cut right down. Initially I figured it needed a repair but then I realized that there was a large dorsal extension to the fin. This would compensate to some extent to the missing top but whether it is a good configuration, I can’t say. It didn’t look good to me but it looked airworthy so maybe it flies fine? Has anyone seen more about this and can share with me some of the history?