I gather from what you've written above, that you believe the seal to be genuine?
Good to know that I might not have bought a jar with a faked seal after all!
Good grief,how did you interpret it that clearly ? I am saying that your seal is bereft of clarity and somewhat Heath-Robinson in execution,and that genuine seals should ordinarily have more definition and probably an ID code for the packing Depot. It is of course POSSIBLE that somewhere in the genuine system such a seal was used,who can say.
Somewhere here someone suggested contact with the IWM ? There may be examples to show and to give you a more positive answer.