Each brand has a unique way of embossing and lettering on the bags. For example, the Gucci Guccissima leather is embossed with the GG logo and the Louis Vuitton Vernis leather is embossed with their monogram. Fake bags are usually over embossed, with much darker/deeper lettering.
Most products from luxury brands have unique manufacturing batch numbers. Always compare the format of the date and the font. For example, Gucci bags have a particular font, and Chanel bags have a unique serial number for every bag with the first two digits signifying the year of manufacture (eg.13XXXXXX). Moncler jackets come with a Certi logo (style can vary depending on year or brand)