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My 1975 looks just like yours. It has a vacuum hose on top, and an open tube on the side of the base plate for atmospheric pressure.
My Bosch book lists 1974 - 1977 specs together. There are cold control pressures listed for:
0 438 140 008
0 438 140 009
0 438 140 017
and
0 438 140 033
The book shows for a 1975 911S:
0 438 140 009
But like others have said, yours could have been changed sometime in its previous life.
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Rex
1975 911s and 2012 Range Rover Sport HSE
1995 BMW R1100RS, 1948 Harley FL
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