Justin - Good Idea!!! - Hadn't thought of donating an organ for the 70# 1961 Kodiak. To acquire it, I donated the balance of my banking account because it was the last heavy weight Kodiak needed to complete the collection of Special Order Heavy Weight Kodiaks.
As Doc just pointed out, it has a tapered sight sight window. I refer to it as the Wedge sight window, which was the standard Kodiak sight window configuration up through 1956.
In 1957 the Kodiak sight window was changed to be scalloped, somewhat similar to the four 1961 Kodiaks to the left in the photograph above.
However, from 1957 to 1962 the Wedge sight window was used on some of the heavy weight Kodiak and Kodiak Deluxe bows (heavy weights were available on Special Order). Bear possibly made other models of Wedge sight window bows, or special order heavy weight bows, that I have not heard of... yet.