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OEM Amigo / E-TOP, same parent OEM product as the Sapido AU-5125 (WU319d)
"EPMBPCI019XXX3XX" is silkscreened on the board in the FCC photos.
This device is in the RTL8192DU source as a RTL8192DU-VC adapter.
E-TOP FCC ID of U6A-WU319D, Planex FCC ID of SJ9GW-USFANG300