Looks like an original later issue 4-stem Heubach design to me. From these pics, I can't see whether or not the pin's a replacement, but perhaps a 3/4 close-up on the hinge area, with the pin open will reveal more...
Looks like the proper sheps crook for this maker's pin and doesn't appear from the picture to be replaced IMO. Actually, I looked closer to the end of the pin and it's got a light bevel on it -which is totally good.
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