In 2006, the complete #5904 series (with the G2 Saddlebred) was also sold carrying number 720116, by Target a.o.
Some asume there are visible differences in colour between both series, but you're more likely to find differences between the early and late #5904's than between the two series from the same year. Not only can colour variations be found in both series, but there are also opaque and more translucent models.
The 5904 cards have no copyright year, but odly enough, there are also 720116 ©2006 cards with a 5904 sticker over the barcode. Maybe they made too many of them?
Since most of the models on this page are randomly bought second hand, the ones without a package reference could be from either of the two series, or, if applicable, from even another set or series.
All of the G1 models from ongoing sets and series had to be replaced in 2006, because the lease contract of the casting molds with Hagen Renaker ended. Here the G1 Saddlebred got replaced by the G2 one.
#5904 originally sat on undated cards (the word 'Stablemates' on the front is in red), but there also are stickered ©2006 cards (the word 'Stablemates' on the front is in blue), which actually are #720116 cards.
Translucent and opaque specimens can be found in both the original #5904 and the #720116 series.