My 1997 AP 155EDFS has an oil spaced objective. My 1999 AP155EDFS also has an oil spaced objective. I've never seen anything about AP making an air spaced 155EDF f/7.
AP did make some air spaced 152mm f/9s around 1991 and may have made a few 155mm f/9 EDTs air spaced in 1992 but I think most the 155mm f/9 EDTs were oil spaced. My 155mm f/9 EDT made in 1993 was oil spaced. A friend has it now. It looks great and has absolutely outstanding optica.
If it looked bad from when you received it from AP, why didn't you return it?
Something doesn't smell right here. From your photos it looks like someone tried to clean both the front and rear surfaces of the objective. That gray stuff in the lower part of the objective looks like some type of film on the back of the objective.
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