That's the "other" Pedro Martinez. The guy who had cups of coffee in the bigs over a few seasons, mostly with San Diego. I got Pedro "Future HOFer" Martinez's signature several times and although his "rookie" sigs are much different than the one people know today, it didn't look like that.
I didn't see any IP examples of Pedro A. Martinez, but here's his 1994 UD Collector's Choice Silver Signature variation, which almost exactly resembles the example you posted.
http://www.ebay.com/itm/1994-COLLECT...1b#ht_22wt_902
This was the closest I could find on eBay to the rookie sig of Pedro J. Martinez:
http://www.ebay.com/itm/Pedro-Martin...ht_2809wt_1230