The Enigma G was used by the German Abwehr and is also know under the BP name of 11-15-17, the latter referring to the number of notches on each wheel. It does not have a plugboard and it has a movable UKW. Furthermore this machine does not feature the double stepping anomaly of the service Enigma. It's a rare device and not many of them are in existence today.

Although the G-312 simulation has been tested against the actual machine, different variants of the Enigma G exist. You are likely to find versions with completely different wheel wirings. 
