Sei and tre tacche - define it for me, please

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OK, I did try to google it and couldn't pin it down.

As near as I can make out "tacche" is notches and it's either 6 of them or 3 of them.

Huh?
 
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Yip, "Sei Tacche" refers to 6 notches and "trei tacche" refers to 3 notches on the caseback.

Am I correct in saying that the trei tacche is more rare/valuable?