Pretty sweet find! Do you ever send these in to a TPG? (If so) what is your success rate for getting the varieties attributed?
Mike Diamond may do this one . Anacs wanted 7 bucks extra for a Variety, at the Fun Show last November ...
9 bucks on ebay . Free shipping .......... http://www.ebay.com/itm/1973-COLOMB...xxG7It%2FM45y%2B18WoM%3D&orig_cvip=true&rt=nc
I thought I recognized it... I have one of those somewhere. I had these two listed as MD. First is 1972 second is 1975.
This one looks like your 72 https://www.cointalk.com/threads/1972-colombian-10-centavos-ddo-error.264850/ I think the 75 good too ...
These are the only two other photos I have of them. I agree, knowing what I know now, that they are more than likely DDOs. If you notice, the word on the left (Republica) is pretty fat on both. I wonder if they once looked as awesome as your specimen and wore down, or something else.
On the note of 1973 Colombia, what are your thoughts on this one? I unfortunately don't have a whole coin shot (I took these photos two years ago). I thought this might be an overdate.