About 10,000,000 of each of the one and five Centavo pieces were struck in 1958 in Philadelphia, and so dated. But of the 10, 25, and 50 Centavo pieces (so dated) only 1,000 of each were struck in 1958. These would presumably have been presentation pieces, whether given or sold, gathered together into sets of some sort or provided individually as individual coins. It is also suspected that some percentage of that 1,000 "sets" may have been proof strikings, though I have not seen any in over 20 years of watching and have seriously come to doubt there being any proof strikings. The balance of that initial 1,000 would have of course been business strikes, indistinguishable from those found in circulation.
I have seen several different "sets" of 1958 Philippine coins in various official-looking packages, but there is no means by which one can ascertain whether any of them is authentic, and therefore at least proof of being from among the first 1,000 sets of these coins.
Sat Aug 01, 2020 12:23 pm by John Edoward Miguel
Subject: English series mint set 
