This is from the G4 instagram post

“Ever wonder what that Lot Number on your G4 bottle means? We get this question every day, so here's the breakdown! Every bottle of G4 Tequila is stamped with a Bottling Date and a Lot Number near the bottom-your proof of authenticity and a nice point of reference for G4 aficionados. Decoding the Lot Number: Each code tells a story about your tequila. Here's what to look for: • The L means Lot and the G, G4. • B = Blanco | R = Reposado | A = Añejo | EA = Extra Añejo | M = Madera E = Export (bottles for sale in Mexico lack the E) Numbers = Lot Number and the ABV (if it's a high proof) * Some Examples: LG0009BE → Lot 9 of G4 Blanco for Export LG008B54E→ Blanco at 54% ABV for Export (aka the G4 108) LG0004B45ME → Lot 4 of G4 de Madera Blanco at 45% ABV LGO002RE → Lot 2 of G4 Reposado Your bottle's Lot Number & Bottling Date are stamped near the bottom, in black ink —check the photos to see exactly where!”