Counterfeit Saigon Beer

When in Mui Ne I often head to Lam Tong for dinner after a long day of kite surfing. They have the big bottles of Saigon Beer for only 8,000 VND or about $0.50 US. I recently learned that these beers are often counterfeit.

The advice I got was to check the bottom rim of the bottle. If the rim is missing the raised lettering, then it's a counterfeit. I'm not sure if the opposite also holds. If the bottle does have raised lettering, does that mean it's legit?