New gof 1600 with black cross and burnmark out of box

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I recently bought a brand new in a sealed box gof 1600. On the motor unit there is a black cross written with a sharpie. In the middle there is a burn mark. 

this got me wondering if the product is marked as a defect or something else from the factory. Does anybody know what this could be?

This post was edited by Eirik on 09.04.2021, 21:40 o’clock
Reason: Misspelling