Just pulled mine out of the closet
Measurements didn't make much sense. Probably some components are affecting them.
R160 = 83.5 ohm (can't read the marking)
R159 = 83.5 ohm (301R) is 301 ohms
R163 = 83.5 ohm (150R) is 150 ohms
R161 = R162 = 75 ohms
From your picture it looks like R160 = 301 ohms
They are all 0.1% resistors
http://www.vishay.com/docs/31027/cmfmil.pdfThey are Dale (now Vishay) Mil Spec resistors RN type
I hope this helps.
TTI wave generators look like the Waveteks. I think at one point they purchased them. FLuke has also some Wavetek looking function generators.