[NoCmpromiz]

What you have pictured there is a Turtleback Four Rotor Enigma Machine. Here is what the four rotors looked like in their usual configuration:

The spooks of Ultra (GC&CS at Bletchley Park) succeeded in deciphering many Wehrmacht messages encrypted on the standard versions of the Enigma Machine, but never could decipher those encrypted on the Turtleback version.

This had something to do with allowing the turtle to enter the initial settings and required an operator skilled in Turtletalk to obtain those initial settings from the turtle thus adding yet another layer of security. Bletchley Park did not have a Turtletalk translator which completely stymied their attempts at deciphering those communications.

After the war the cadre of Nazi coding turtles and their talkers were captured and tried as war criminals. The talkers were sentenced to write for Benny Hill since the court found they were insane from the start, and the turtles were sold to Polly Bergen where their unction lived on in her Oil of Turtle line of cosmetics...

I have more fractured historical facts to relate for this story but I have been summoned for a secret mission to the field East of the Silo. You know, where the assault weapons are buried...

[Gefn]

Is that where Turtleback Zoo gets it’s name from?,

[Covenantor]

Ach so, you have knowledge of the secret SchildkroteGesprechenGerat. Your guess is close to the mark based on the limited data at Bletchley Park. So here is another piece to the puzzlement.

As you can see the critical component developed in the Great War lacked only the software that SGG made possible. Sadly that lack resulted in the pictured equipment being sold as surplus to various BierSteuben. Reduced to amplifying polka music. So sad.