@ShotgunX There probably isn’t any on purpose. Manufacturers overseas routinely leave branding off items to allow them to be bought and sold by many different companies at the same time. You can buy the exact same product from two different companies for two different prices, but there’s only one manufacturer making said product. Amazon and AliBaba are two major offenders doing this.
At the rate these disposable masks are being made/bought/sold, there’s probably zero branding/model number.
Got these from a Morningsave offer. They are super thin and upon cutting open only 4 layers, not 5. Nose clip is internal thin plastic instead of exterior metal clip as shown. Ear loops vary in length, some fit tight and others do not hold mask to face. Total garbage and misrepresentation as claim 5 layer. Wear at own risk, likely no protection more then standard surgical mask.