The pictures do not change my conclusion. Neither does the elaborate story of the seller.
I continue to believe that this is a home-made addition to a stock M49.
Here are additional reasons why I am suspicious about the seller's claims of rarity: the seller does not tell the truth about the age (or originality) of the rest of the mic.
This mic is not a stock 60 year-old M49, as he claims. Until the mid-1950s, M49 had a red jewel in front, not a Neumann badge. And even after introduction of the badge, for a few years the mics continued to have a nickel-plated basket retainer band, not a painted one. Besides, the whole basket looks awfully new to me, and not exactly period-correct, even for a late 1950s or early 1960s M49.
In addition, neither the capsule (from 1994) and lead out wires are period-correct, nor are the few electrical components showing under the hood and on the side.
The switch is a pretty smart idea (though esthetically questionable): a torque lever, actuated from the front of the mic, will operate a sliding switch connecting to the 1000 pf capacitor bridging beetween front and rear diaphragms.
Can you also let the readers know what your personal interest in this mic is?
Thanks,

Damn you Mike.........!!!!!!!