Raspberry Pi 4 Model B | How to Check Board Revision / Version

Raspberry Pi Foundation is always coy with its board revisions so let us zoom in and unravel the mystery.
The full guide - https://core-electronics.com.au/tutorials/Versions-Raspberry-Pi.html?amfpc_refresh

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Raspberry Pi Board Identification: https://core-electronics.com.au/tutorials/raspberry-pi-generations.html

Raspberry Pi Compute Module Identification: https://core-electronics.com.au/tutorials/compute-module-generations.html

Raspberry Pi 4 Model B (4GB) Ultimate Kit Bundle (AVALIABLE!) - https://core-electronics.com.au/raspberry-pi-4-4gb-ultimate-kit.html

Raspberry Pi: https://core-electronics.com.au/raspberry-pi.html

RPI 4, 8GB: https://core-electronics.com.au/catalog/product/view/sku/CE06974

RPI 4, 2GB: https://core-electronics.com.au/catalog/product/view/sku/CE06424