1970 340 Balance Problem...Bottom Line

Here's a close-up of the 70 340 balancer from the back side......Look correct? Some have said it should be flat and symetrical, others have said the opposite in previous threads.

Maybe I'm looking at the wrong side here........Looks like a counterweight cast right in to me, and a hollow on the other side.......that would mean external balance........but it's a 1970 cast with the original forged crank.......

What say ye' ?

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