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https://www.openhardware.io/view/8227/Simple-compact-RS485-node-v2-ATmega328-MAX3485-W25X40
ATMEGA328PU-KR which i see on image is fake clone and really not product of Atmel (now bought by Microchip)
Most likely you are right, nevertheless, all my simple devices are working correctly, the only problem that I have encountered is a problem when flashing some controllers through the USBASP.
