[SteveNuts]

I thought the commercially available models did not include the pegboard, which was crucial for the higher # of possibly combinations?

[cyberferret]

I think you are correct. Also, the Kriegsmarine version had an extra rotor, plus they also used a secondary code book to encode keywords before encrypting on the Enigma.

Those were, from what I hear, much harder to break, thus the efforts to capture the code books and devices from the U-boats.

[detaro]

If I remember right they also used different rotors (and added more of them to swap out over time), so that's another thing to capture.