Alan,someone will come along that knows a lot more about them than i do, but i have two 59 polars.One of them is as nice looking as any bear they made, has a rodewood sight window that is out of this world.The other one i have is very nice too but the sight window is not as striking.The early polars where long bows.A 59 is a recurve but not curved as much as the same year grizzly or kodiak.I cant really tell much diffrence perfomance wise, they shoot very nice.Sometime in the early 60,s they changed to more of a recurve and look to be more geared as target bows.Judging by yours being 66" long i would guess yours to be one of those.The shapes,curves on those look good but usually not as fancy wood as other bear models.I have always wanted one of those target type polars because i like longer bows anyway.The early kodiak specials were longer bow lengths too but had some of the prettiest wood combinations of any bear models in my opinion.Another good thing about polars is,,they are not as sought after by collectors so you can get very good deals on them.