Nothing I have, electronic or physical, can get a decent image.
Moot at this point, it's an ATMega328P with a CH340.
Looks like it uploaded and verified
OK but I have a couple Elegoo Uno R3 boards too, and they're different colors. A generalized procedure would be helpful.
There can be no other procedure than reading the marks on the chip.
You're welcome to post pictures of the others in this thread.
Having read this again, I'm not understanding what you are trying to achieve. If you have an UNO, then the main chip should be an ATEMAG328P. Those other chips you mention may or may not be used to implement the USB-serial connection between the ATMEGA328P and the host PC.
What is requiring you to specify a chipset? If you are trying to re-target the UNO code to run on one of those other chips, then you would need to know what the UNO code did and what hardware (UARTs, SPI, I2C, PWM etc) it might need and if that functionality is present on one of the other targets.
The USB chip can be identified based on VID and PID. But a clone Mega with CH340 and a clone Uno with CH340 will report the same VID and PID.
Not sure how that helps to identify the main processor.
Must be one you dont use Mark its a bit dusty 
I have the same problem , I use one of those cheap cameras off wish for ear inspection that have brightness control for the leds . their ok to inspect ears but rubbish for cleaning but they work ok at magnifying stuff.
I remember that the manufacturer in China will write a string of codes on the chip, the chip I bought at FS Tech before is like this, I suggest you to contact your seller directly, he will tell you everything.
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