Rear Sight Leaf vs Leaf

[painter777]

While digging out a few flip sight bases for another post, I ran across these 2 flip leafs.
I remember buying a cheap repro from Nick for the spring to repair that .U. marked base and flipper. But now I've got these 2 leafs mixed up.
I'm pretty sure I know which is the real one, but would like comments to be sure.
Don't want to take another one apart to compare.
Last time I did that Marcus threatened to cut my fingers off!

Please look at the bottom pivoting area.
Can anyone tell me which could be the real one vs the repro from these pictures?

Also wasn't there just one style for these bottoms?

Appreciate your help,
Charlie-painter777

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[ScottR]

Left is real USGI.

Scott