This was from the breeders website : (quote and pictures directly from ballpythonaddictions website)
Note* This quote was from 2009.We recently hatched a 4 egg clutch from a Graziani Pewter to a Yellowbelly (Het Ivory), which yielded 1.2 Pewters and 0.1 Yellowbelly. Odds dictate that the yellow belly morph should in theory be inherited by half the clutch. To date, no research of ours has revealed what a Pewter Yellowbelly would look like. We are not aware of any being produced. We searched the litter for the common markers of the yellow belly trait which are faded heads, side flames and checked sides in the side of the belly. With the Pewters reduced sides, no flames or checkering is evident. One particular female that hatched, had a really faded head, almost looked purple pre-shed. We suspect that she may be a Pewter Yellowbelly. One Pewter male in the litter came out with a cool little yellow splash not common with the Pewter morph. Yellowbellies have been known to do some strange things when bred to with certain morphs. We are going to hold this litter back to test breed it.
This is the male from the clutch and who I believe is her father :
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