[Mondial]

Yes Ron, that's what I was referring to. The earlier models with the regular tuning cap vs the later with the split stator cap. The dial calibration is different.

I kind of remember this because I have a late production 38-116 code 125 which has the newer split stator front end and saw the schematic of earlier 121 chassis has the 37 style tuner.

I wonder if the dial scale is lined up correctly. The 38-116 has an alignment procedure where the tuning cap is first fully meshed and set to the index. The cap is tuned back to 4.71 MHz and the dial is then reset again to the index. Since the 116 and 690 both use the same tuning cap and dial, maybe this procedure would be the same and increase the dial accuracy?

Check the dial alignment procedure for the 38-116 code 125, as it is not just setting simply to the index line.