That label likely had whatever identifying marks the board ever had. Most 
likely a copyright notice and firmware version number.
 

    On Friday, December 1, 2017, 9:42:32 AM MST, mike stedman 
<rav...@gmail.com> wrote:  
 
 If I had to guess, the window on that chip indicates that it is probably a 
UV-erasable EEPROM. It most likely shipped with a sticker to keep it from being 
erased, which has now fallen off. I'd probably put a new sticker on there to 
block the sunlight and keep it from getting wiped.
  

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