FIFTY CENTAVO BUSINESS STRIKES
The large size makes these coins very lovely, but it's an extremely difficult series, filled with dates that are almost impossible to find in unc condition and dates where it is indeed impossible to fin in gem unc. The 1903 for instance is a hoarded coin and is the most common in unc. But I had the misfortune of having to buy 3 rolls of these 50 centavos in so-called unc condition as part of a bigger deal and they were all unc but they were so filled with bag marks, nicks and dings, that out of three rolls of uncs, all I got was one MS-63, all the rest came in at AU-58 to MS-62. So there's a coin that's common in MS-60 to 62, scarce in 63, and rare in 64 up.
The famous 1903-S, is the rarest of the 50 centavos, only two are known, both have been graded XF-45 by ANACS. The '05-S, '08-S, '09-S, are all killer dates. As I write this for the 1903 50c, 50 coins have been graded unc, far and away the greatest number for any 50 centavo piece, but only 1 has been graded gem. Take the 1905-S, which is one of the key dates, only 7 uncs have been graded and none of them are gems. It's the same also for the 08s, there are only four uncs and only one of them is in gem. But it's a fun series, and if your patient you can get the coins at least, in almost unc.
The 50 centavos series is impossible to complete in unc condition because no 1903s 50c has ever been found in unc. There are only 2 known, and they're both graded Xf-45.