FS: Engine oil cooler

Very good condition engine Oil cooler, MY78 911 SC, ultra Sonic cleaned and pressure tested, 400€ + shipping

Has anyone figured out the code meaning on these (eg G7) is it a date system used by Behr, some sort of version number etc ? Just curious as I’ve seen different single letter with digit combos?

Reduced price, 350€ + shipping
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Still have this engine oil cooler
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Now 300€ shipped
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Good condition engine oil cooler available
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Still available
Thanks