The first position is the letter, which represents the production month, and D represents April. A stands for January and B stands for February. Coach skipped the letter I, so M stands for December.
Distinguish the true from the false: the zipper head is usually leather or a string of nested small rings. Packages without this function are fakes. Zippers are generally printed with the letter "YKK" trademark, which is a relatively high-end manufacturer of Coach. If it is not "YKK", then this bag may be fake, but it is not 100% sure.
Coach zipper features:
Zipper sliders are generally leather products or a series of small rings embedded with each other. Brand bags without this function are imitations. Generally, the zipper is printed with the English letter logo“YKK ",which is a higher-level manufacturer of Coach. If it is not YKK, the brand packaging may be fake, but it is not 100% without doubt.
Don't be confused by technical terms. If you see "designer inspiration" or "A-level replica", don't be deceived. This brand of bags are often marked like that, just to prevent disputes, and other "high-grade imitations" should be refused to buy.