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No need to apologize, that's the best part of this forum, and how I learned what I know. The "feet" are locating pins on the back of the brass dial plate
Images from: https://tambowatches.com/can-you-put-an-861-dial-on-321-movement/
I’m just trying to investigate when the dial was replaced, I’m under no illusion that it is missing the original all important dial which is a shame - not from a money side of it, but from an originality side of it, as the watch will never be for sale, my modern watches will go before this does.
As you previously speculated, it's plausible that the dial was repainted by a local shop during repairs in the 1970s, since your father indicates that there was water intrusion, which often causes significant dial damage. However, there is really no way to determine this by looking at the watch. Only your father might potentially remember. Most likely the dial was damaged at some point, he brought the watch in for repair, and it was returned with an undamaged dial. Perhaps this might ring a bell for him, but honestly these details tend to fade with time. Unless I keep records, I can't always remember what was done to a watch even 10 years ago.
In any case, the date of the repair is of no practical consequence IMO. The watch was worn by your father in its current form for many years, and that fact either has sentimental value for you or it doesn't. If you would prefer to return it to a more original state, that can be done by purchasing period-correct parts.
Great analysis here by @ngdal. The first thing I noticed was the O’s in Professional. Original has less rounded shape. And of course original scripts have much better serifs. Easy to spot when have well focused photo.
Despite the watch not having original parts I would never sell it. I intend to pass some watches to my daughters too one day if they are interested.