Rare! Original WWII German belt w/t nazy swastika

Unique very well preserved German WWII leather belt with aluminum buckle. There are several marks: On the buckle reverse we can see three rounds with the letters FLL inside and the number 42 near them. The center is stamped with the Nazi cross swastika. The other end of the belt is stamped with two marks: "D.R.G.M." on bottom. On the leather part there is another stamp of three letters and 8 numbers but it's hard to be read.
Probably the belt was shortened and now it's full length is 87 cm/ 34,3 inches. Width 4,4 cm / 1,73 inches.