Historic home statement front window replacement

One super prominent feature of this home is its long living room with (approx.) 7'x7' window at the front. It lets in tons of sun in the morning (it faces east) and a good amount of light most of the time. It's a great!! But it had a lot of issues. Almost all the windows on my 1937 home are original wood windows, including some leaded glass ones. They are very cool and help the house keep its original character. But this window was failing in several ways. 

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