the meaning of the single and double arrow behind the lugs..

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I have seen many variations of this curious symbol.We know that the arrow stamped on the lug is a sign of improved movement,

but i don't know again the real difference between 1 or 2 arrows.

My carrera has two arrows,calibre 11-I

My siffert autavia 1163t one arrow,calibre 12 with the writing 12 in a circle.

what is the meaning of 1 or 2 arrows?

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