Does anyone know whether the BenQ DW1680 is a real BenQ or a Liteon OEM
It's an OEM of LiteOn 16A1P.
I don't think it is 16A1P OEM because it has the BenQ case and also does DVD+-RW 8x CD-RW 32X & DVD-RAM 12x
just crossflash it and you will find out
As DimeDeviL says, it's an OEM LiteOn. To prove it you can see if it works with the EEPROM Utility and the Flash Utility.