SGC has routinely labeled backs for quite some time now (more than a decade, I believe). I think you'd be hard-pressed to find any that don't have the back identified (the ones labeled just '1912 T207' are the anonymous backs, FWIW)
They do not, however, include the factory number for Recruit and Anonymous backs.
Here's a pretty old-school one (and because every thread needs a card)
--
Mike