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X-metal original grey restoration

That SN is Laser Etched Using heat to anodize the titanium oxide layer with the serial number. This is how all the gold color SN are printed on XM.

The R1 SN's are actually laser Etched within the Titanium
I'm not sure its heat anodizing. I've aggressively etched a serialized plasma frame and anodized the whole frame and the serial number stayed intact. The etch would remove any anodizing after about 1 minute and I did them for 5 and its still there.
 
Another pair restored, with close up before/after pics for comparison. A sample mint piece was tagged with the blue label for reference.

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