You are spot on as I did a cloud of my two and see a goldish dot that replaced the blue one. It is likely an attempt to get rid of the blue one.

The Santo was the final card I needed 25 years ago when I completed my set - I always thought I had one with a unique stain on it, but I guess not - and it is interesting that it doesn't obscure the white border at all. I checked and sure enough my Tresh is similarly stained.

Well, I got two more to chase down to finish this set now! Thank you for these

I just noticed on your blown up images that there is a second smaller spot of blue, on both your copies, by his armpit area. I will have to pull mine and look at others to see if this is consistent on all cards.

Seems odd they would not just cover up the spot with white ink, instead of the yellowish greenish goldish color. Can't really think of another good explanation for it than what you propose.

Defect in the second degree?
 

I was checking for 1967 defects on eBay tonight, and this posting for #214 Dick Kelley gave me a good chuckle.

(The 3rd Series checklist #191 comes in two versions, with #214 as Dick Kelley or correctly as Tom Kelley.)

https://www.ebay.com/itm/38468818553...u&LH_Auction=1

Uncorrected error ? :)

Because the process doesn't use white ink.

If the defect is on both the blue plate and the yellow plate, that means it's from somewhere in the process of making the plates. And one that ended up on the mask for both colors.

If you redo the image to fix the blue mask, but not the yellow, the blue dot will go away, but you'll still have the yellow one. Which they may or may not have corrected since it's not as obvious, and the color separations were relatively expensive at the time.

More like an unerrored correction.

Looks like that the spread sheet they use to create their listings has an error....all of their offerings for this card are the 214 Dick Kelley variety. Several other sellers have the same mistake and probably downloaded the same on-line checklist that they are all using for their listing spread sheets.

I don’t know squat about printing so perhaps I phrased it wrong or used incorrect terminology. If they were able to make white in every card in the set, why could they not have simply made this spot white instead of the yellowish color to correct the error? Making an area of the card white does not seem to be difficult, as they were able to do it in every card in the set.