What bulb is this?

[mike96ws6]

I replaced these bulbs with Phillips Extreme Power 9007 bulbs. Is this bulb identifiable by the 'CK'?
https://www.dropbox.com/s/xcw7d93v7h96to3/20180601_110923.jpg?dl=0

 

[mike96ws6]

or 'GK' rather.