Dan - It's great you are taking the time to share the fun of your find with the rest of us. Back in the late 1970s, I saw a Bertha on the floor behind the counter at Lens & Repro in NYC. I knew what it was, but made a point of not asking "How much?". I don't know if it had a lens as big as yours.
The last picture in your blog looks like a 4X5 spring back has been adapted to the camera. Is that what I'm seeing? It makes sense. Reducing the film size from 5X7 to 4X5 would give a tighter framing of the subject and reduce film costs. It would be interesting to know how many sheets of film were normally used during a football or baseball game.
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