Mulvey has three poses, all of which first appeared in 1887 (relatively common leading "0" numbered issue).
332-1 Mulvey, Joseph . . . . Hands on thighs, ball head high
332-2 Mulvey, Joseph . . . . Strike, ball chest high
332-3 Mulvey, Joseph . . . . Catch, hands above waist
Poses 2 & 3 were re-issued a number of times. Both can also be found as Gypsy Queen and Old Judge cabinets. PL cards were only issued in 1890, the only year the league existed and the last year of Old Judge production. Only the 3rd pose has been catalogued as an 1890 "PL" issue.
Hope that helps. If you have interest in the set and 19th century baseball in general, you'd enjoy the book that was published nearly a year ago now:
http://cgi.ebay.com/Old-Judge-Photo-...item2c526dce09
Edit to add that all the examples above date from 1887 (NL cards). In almost all cases, 1890 PL cards are found with a hand written or block text "PL" somewhere on the card. The 1890 PL cards are tough to obtain even by Old Judge standards.