Help interpreting tuner specs

These are the readings from my old tuner after testing: Distortion @ 1 kHz - 100% modulation

Left Wide IF mode 0.053% Narrow Mode 0.18%
Right Wide IF mode 0.054% Narrow Mode 0.18%

Stereo Separation @ 1 kHz - 100% modulation

Left into Right Wide IF mode 64 dB Narrow 57 dB
Right into Left Wide IF mode 63 dB Narrow 56 dB

65 dBf RF input quieting - unweighted (Signal to Noise Ratio)

Mono -72 dB
Stereo -75 dB

50 dB quieting points - unweighted (Sensitivity)

Mono 0.5 uV
Stereo 22 uV

Do these readings represent good tuner specs?
Those all look like fine numbers, except that I'm a little uncertain about the 50db quieting points. The 0.5uv mono sensitivity seems too good to be true for 50db quieting. And while I believe 22uv is a fine number for stereo, I'm a little uncertain because most tuner specs these days use dbf units rather than uv. Hopefully someone else will comment further on those two numbers.

-- Al
I did some calculations on the 50db quieting numbers, to convert them to dbf (decibels above a femtowatt, which is a quadrillionth of a watt).

If the tuner's antenna input is 75 ohms (i.e., a coaxial connector), 50 db quieting occurs at:

Mono: 5dbf
Stereo: 38dbf

If the tuner's antenna input is 300 ohms (i.e., screw terminals that accept 300 ohm twinlead), 50 db quieting occurs at:

Mono: -1dbf
Stereo: 32dbf

The stereo numbers appear reasonably decent but not exceptional. The mono numbers, as I indicated above, appear to be too good to be true, and I suspect represent a mistake.

You can find the numbers for a great many tuners here:

-- Al
I agree with Al, these look like extremely good numbers.

I find measured sensitivity numbers a bit difficult to correlate on my own test bench, and there are a few sources of possible error. First, many FM generators (like my old Sound Technology 1000A) have a 50-ohm output, so you need to use a matching network for proper calibration of the output into either a 75-ohm or a 300-ohm antenna input, and add the attenuation of this network to the signal-level dial calibration. Second, I find that there are a handful of RF-noisy devices around my bench, and sometimes don't feel like turning them all off to get a super-precise measurement. And there's the matter of the disparity of your mono vs. stereo readings - if the composite or pilot modulation level on the signal generator is off a bit, then it will show up here.

But if your tuner is indeed acheiving the performance you describe . . . it's working just fine.
Thank you for the responses. My thirty-two year old tuner recently has some modifications and an alignment by a respected broadcast engineer and circuit designer.