Can someone tell what size buss bar this is?

[William Harrod]

Unfortunately no markings on the service panel. Is there any way to tell what the rating of this buss bar is? Incoming electrical shows a 200A meter but we all know that does not mean much. Two breakers, one for a 125A subpanel the other for the AC unit.

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[Rollie Meyers]

Is the data still intact on the door? If not, that is one of my gripes that manufacturers do not make them sufficiently durable for the life of the equipment, and Challenger is not around anymore either.