cutler Hammer Ch breaker

I am working on a church electrical.... It has a cutler hammer ch breaker pannel made in 1969 A breaker had failed 60 amp 2 pole....
i bought a new breaker but a triangle had been but out of the back of the old breaker to accomidate a bar going down the middle of the pannel.... please help?
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Question: CH or BR? 1969 would be a Westinghouse more than likely.

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