The Numista catalogue shows only two entries for the cob-type 1 Real Philip IV Potosi, Bolivia: years 1652 and 1656.
Just to give the chance to register coins of this type/group with other years, I suggest correcting and changing the entries this way (following Krause & Mishler):
1) 1 REAL - Philip IV (IIII)
1622-1648
Silver (.9310), 3,3834 g
(Comment: this includes KM # 12 and 12a)
Variants -if any- should be highligted individually in the list of years
2) 1 REAL - Philip IV (IIII)
1649-1651
Silver (.8960), 3,3834 g
(Comment: this includes KM # 12b)
Variants -if any- should be highligted individually in the list of years
3) 1 REAL Philip IV (IIII or IV)
1652
Silver (.9310), 3,3834 g
(Comment: this includes KM # A13 and B13)
Note: the Numista catalogue has already an example-picture
4) 1 REAL Philip IV (IV)
1652-1666
Silver (.9310), 3,3841 g
(Comment: this includes KM # 13)
Variants should be highligted individually in the list of years
Note: the Numista catalogue has already an example-picture
Many thanks in advance!