Just wanted to share some information I learned after about 4 phone calls and several hours with Samsung support.
The charger that is "in the box" for the galaxy watch 7 has a base part # EP-OL300.
Unfortunately this charger is not yet sold separately but should be in a few months time.
The charger that shipped with the galaxy watch 4,5,6 was EP-OR900 ( think full # EP-OR900BBEGUJ or some variant). This charger will work with the galaxy watch 7 but will charge about 30 % slower than the EP-OL300 which is designed specifically for watch 7.
I was wondering about this tiny code too. The short answer is that this is not the code you are looking for. The actual model number and electrical specs are on the cable itself.
The tiny "QR" code is a data matrix code, comprising an internal model number and the serial number of your charger. I believe this can be used to verify authenticity.
One more thing: While the EP-OR900 and EP-OL300 have similar electrical specs (i.e. 10W), the shape of the Watch 7's rear glass makes it sit sub-optimally on the EP-OR900, which reduces the charge efficiency.
