which way

Depending on the make, it doesn't matter unless you swivel the shanks and it goes further one way than the other. Then, it's better having the swivel towards you. My kimblewick has equal swivel and folds flat on itself both ways.

With a curved mouthpiece (which I don't think yours is) then the curve points rostral.
 
Ok, well there were other ways to take your question .... and you wouldn't be the first person to have a bit on upside down ;)
 
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