Glatt Kosher stylized K / CK marksCK
USA
CK
Mark: Stylized K and C-K marks with 'Glatt Kosher' Hebrew label
Recognized endorsed by 1 major authority
COR
Unknown
Glatt-kosher stylized K / CK marks shown bottom-left on back of COR Kosher Symbol Card; exact agencies not confirmed.
How to use this safely: a listing here is not an endorsement. Only trust an authority if one you (or your community) already follow recognizes it — see the “endorsed by” tags above. Standards vary by community and by individual ruling, so always confirm with your rav.