Arduino shield for OLED module

The production and shipping are very quick. The circuit pattern, through holes, resist,silk screens, color, and cut lines are accurate. There seems no misalign of silk screen. Especially through holes seems like mirror. Beautiful. No defects found. Good workmanship. There is a number on silk screen, which seems a kind of control number. I wonder what is for, and whether I can specify the location.

Jul 04,2020
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