This is an aplanatic casket set - model C from Busch.
This was termed the Unicum set - and indeed, it was supplied with (size 2?) a unicum shutter.
The shutter gave up the ghost many decades ago - no mechanicals remain.
I have another (size 1) unicum and can see that the RR cells in this fit well into an Alphax (1?).
I have no illusions about the availability (and reliability!) of the bigger Unicum shutter, but perhaps there is a second/third generation shutter that has the same dimensions as the Unicum 2?
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