Check out this auction.
In the auction the guy states:
This auction is for an RYAN HOWARD 2008 UPPER DECK MASTERPIECES BASEBALL RED-FRAMED SP #71!!!! CARD IS NOT SERIAL NUMBERED, HOWEVER THEY APPEAR SLIGHTLY LESS THAN THE GREEN BORDERED SP'S NUMBERED TO /75, SO IT WOULD BE SAFE TO SAY THESE HAVE A PRINT LOT OF /100!!! CARD IS IN MINT CONDITION!!!
I wrote to him:
These appear 1 per box and are not as rare as the brown /100. The browns are 5 per case, the blue /125 are about 7 per case. These are not even close to as rare as the greens /75.
Of course I know nothing of Masterpieces Baseball.