pal super cobra(parker bros)?

[dustylights]

i have two copies of super cobra,one plays perfect the other plays but you have to adjust the vertical hold on tv's that let you do this by hand.
i looked in the data base and not see a pal listing,if i missed it then never mind.
otherwise whats the story?is it pal or is it defective somehow?

[tom]

if it rolls it's PAL, if it doesn't work it's broken.

[dustylights]

the game works but only if the vert-hold on my older tv is adjusted to
compensate for the roll,if it is not a pal version then what would cause this?