First of all, many thanks to Jason Schneider for that excellent write-up on Nikkor lenses!! I have a bunch of these in both S-mount and LTM. They are all excellent.
Second, a question for Jason and the group: Did the Nikkor-HC 50mm f2.0 go through a “tweaking” process during its production run similar to the Nikkor-SC 5cm f1.4? Or was the design of the lens consistent during its run?
I ask because I have a lovely copy of the HC 50 that I purchased from member jonmanjiro years ago after he had overhauled and cleaned the lens. The serial number is 660,0**, which puts it in the 1950s, but the standard reference for Nikon rangefinder lens serial numbers does not indicate a production date with more precision. For comparison purposes, my two S-mount Nikkor-S lenses are later versions, which incorporate adjustments to the Nikkor-S that Nikon made during the production run; one is a Nikkor-SC 5cm f1.4 serial no. 385,0**, the other is a Nikkor-S 5cm f1.4 serial no. 412,7** (which puts it in the early 1960s). (I also have a chrome Nikkor-SC 5cm f1.4 in LTM, serial no. 386,7**).
Finally, in response to das’s comment above regarding the W-Nikkor C 35mm f2.5, I have LTM and S-mount copies of this lens, and completely agree with his assessment of their excellence!