I've read your various posts on framebacks. Was there ever a frameback variety that weren't meant to have their blades removed? The one I have has no screw keeping the blade in place, and it's definitely a separate blade... but I'm not going to risk yanking it apart if it weren't meant to be removed.
Most of them did not no do they now. The screw type removable blade was invented by J. Lecoultre in the 1880s and many different styles came from that type.
~Richard