question about the cromwell

hi all… i have my german armor collection just about complete an i am currently building the 1/72 cromwell from revell… i’ve seen severall pic’s with the cromwell where they have some sort of scale on the turret (see pic below) what is this… and what is it used for?

thanks Rob

That is not a Cromwell; it is a Centaur.

This link will take you to a review of the Tamiya version which, also, gives an explanation of the markings.

http://www.internetmodeler.com/1999/august/first-looks/centaur.htm

sry for the centaur mixup… should have seen it…

tnx for the info