Uni-Compax lugs with fracture lines?

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Any guesses about what happened to these lugs on a UG Uni-Compax? Notice the irregular lines on the back side.
 
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That's totally fine. It is not a fracture but due to the production process and appears on many cases.
 
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That's totally fine. It is not a fracture but due to the production process and appears on many cases.
Thanks @Oku I never experienced that phenomenon before. Do you know what causes it?
 
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You are welcome.
Unfortunately not. My guess is, that the lugs are hollow and that the "fracture" is the fissure where the former plane material is welded together. But I am not a case maker...
 
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You are welcome.
Unfortunately not. My guess is, that the lugs are hollow and that the "fracture" is the fissure where the former plane material is welded together. But I am not a case maker...
That makes sense! Thanks again.
 
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This 'crease line' is seen on many vintage Longines' watches. It is apparently a result of a manufacturing process. It is discussed in this thread from a few years ago.