Oh! So happy to see this thread, because I ADORE my Jerseys!
My original stock came from OKCarla on here; I inquired of her a few times on what her breed line was, and she's told me she doesn't know, and has since sold the entire flock (this was quite awhile ago, so I was surprised to see your post, Chicksdigit). I also have some young 'uns from Maria Hall, and in my opinion, my original ones are much closer to the SOP than the Hall babies (no offense intended).
Here's a 7-week old very lt. blue pullet - I just took this picture Monday (I won't use her for breeding, as she's really too light; she has no lacing whatsoever, but she's definitely pretty):
Here's my blue roo, Jethro, with black & splash girls behind him, and some mutts:
He's only about 8 months in this picture:
The horizontal board is 3' up from the ground, so you can get an idea of how big this boy is in this pic:
I'm hoping to find some really good stock this summer, and am working on getting some nice, long-backed and flat-backed girls for Jethro.