This is a 1950s-1960s Dutchess New York Cheese Milk Glass Small Blue Crock w/ Lid.
Number on the bottom is #2, which is believed to link to the size of the crock.
Backstamp reads, in full: "Dutchess Cheese / 2 / New York".
Crock is milk glass that is painted a heather blue on the exterior, with matching lid.
It measures approximately 3.75" H (including the lid) and has an approx. diameter of 2.5" (at the top rim). And despite being small, it is rather heavy for its size.
It is in EUC but it does have a few flaws, including a chip in the rim (see photos) and some dark spots on the very bottom of the crock and the tiny handle of the lid (see photos).