Agree. And looking at photos, for the most part they appear to match with the following:
85091-60004 Sexless 7mm, Sexless 7mm
85092-60007 Female, A Female N
85092-60008 Male, A Female N
85092-60009 Male, A Male N
85093-60007 Female, A Female 3.5
85093-60008 Male, A Female 3.5
85093-60009 Male, A Male 3.5
I find it odd a company like Agilent would have the exact same part number for a 30k or 300kHz part.
Further investigation, it appears the rev A has no support for USB, rev B is rated for 30kHz to 9GHz, and rev C is rated from 300kHz to 9GHz. So while they kept the same part number, the can be identified by looking at the frequency range and ports available.
While the connectors appear in very good condition. I have not yet gaged them but over all the unit doesn't appear to have been abused. I can run through a full 2 port calibration and insert some known devices and the data is reasonable. So it appears functional.
I'd be a little worried that a previous owner has done some mix and matching of parts.
I agree with Miek and suspect an outside house (not Agilent or Keysight) swapped the N connectors for the 3.5mm and then overwrote the factory coefficients. The may not have had a way to change the connector type or model in the devices memory. I assume who ever did this did not have the proper equipment which is why the minimum reported frequency is 50MHz instead of the rated 30kHz.
Still, not hopeless. If Keysight still services these, I may be able to have them calibrate it for the full range with the 3.5mm connectors. This would be ideal but I'll have to check with them.
The other option would be to borrow a set of standards and characterize it myself .
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I had borrowed a set of Agilent 85033E standards that are in cal. These are rated for 9GHz. Using these to create a user setup seems like one option. Sadly, it doesn't appear the PNA's software supports this. Looks like Keysight would be the only option and with it being so old, that may be a dead end. I'll write them.
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Add details to identify the hardware revision