The numbers doesn't really matter - but it's:
ZD2632-DVR-T47D for all types I've that is sold in 25CB and is not printable. (50CB/printable have other numbers).
Oh yeah, there is one around the center hole too, but I don't think that matters. But if you still want it....
Black ink around the center hole on the MBI/India ones: 5112 527 +R E E 08514
Stamped into the plastic on the CMC/Taiwan ones: PAPA10JD06202916 6
Yep, verbatim already contacted - but getting no response from them as usual.
I think they doesn't care as long as they sell...