T-Star: These are WW I vintage, and I don't think they had roof prisms back them. My guess is that the Fernglas (I think that means 'field glass') 08 was built to German military specifications, without prisms. I've seen an identical one by Goetz (sp?).
I also have a Leitz ZF 12; the prismatic sight for the MG 08. It's a different design than the normal ZF 12, which I think was also made by Goetz. Incidently these pictures were taken with a Leica; a VLux-2. I guess you could say I really like Leica stuff.
You're right, the Bushnell was 6X25. Nice binoculars, and easy to carry. The only problem I had with them was once when I was stationed in Alaska, I had them in the side pocket of a mackinaw. The pocket got snow in it and the glasses fogged. My current binocs are a Leica 8X42 BA, excellent optics, but heavy. I often take them to the range when I'm shooting pistol: it's easy to spot bullet holes, even 22s, at 25 yds and easier to set up and carry than a spotting scope.