I need help identifying this 2005 Leaf.
 

I recently Picked up this 2005 Leaf Certified Materials card of Mike Piazza (#SP-31). It's done in the style of the 1890 studio cabinet cards (see scan).

I'm trying to figure out what set it belongs to. Is it an insert? If so, which cards was it inserted with. I tried BaseballCardPedia & the Trading Card Database, but I couldn't find this card at either of these sites.

Can anyone help?

http://www.comc.com/Cards/Baseball/2..._White,sq,i100

That's the standard Donruss version of the set, which has the same back except for the "Leaf Certified Materials" on yours. Possible misprint? The Leaf Certified sets from 2005 don't seem to have the Studio Portraits.

http://www.comc.com/Cards,sq,i100,=2...udio+portraits

The set is Studio Portraits. There are like 56 different versions using the different Donruss brands stamped on them with different colored borders and also b&w or color pictures.

By the serial number I'd guess this from Beckett

2005 Studio Portraits Certified Blue B/W #31 Mike Piazza

though the border looks white to me from the scan