On the 45 Master Technika the reason the sliding flap buttons at the top have been modified is to allow proper fit of the Technika-Flex reflex housing. The Technika-Flex unit came out during Technika IV production (1956-1963) and ended sometime prior to the Master Technika production in 1972. It is not known how many Linhof made but it is pretty uncommon. This is the first one I have seen on a Master Technika. The unusual bits sticking out from under the top of the camera housing likely also have something to do with attaching the Technika-Flex housing.
I would love to see some more photos of this fantastic accessory. Also photos of the manual pages as I have not ever seen the manual!
I keep an archive of Linhof manuals and useful info to help others with their cameras.
Cheers, Chris
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