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Unlabeled MDP - what size


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I was an electrical design/builder 12 years ago, but I have having trouble remembering what size conductors are exactly. 

I am looking at the main on the right. It has no label - which is so wierd. Anyway, it is 120/208. Can anyone identify the probable Ampacity? I am thinking 600A. 

I know it can be identified from the feeder cable. 

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600 looks in the ballpark. I doubt the utility conductors passing through the current transformers could handle 800. 600 would mean 200 through each set of SE conductors, which makes sense.

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