Vintage tin necklace silver beads mexico

This is a great necklace that appears to be stamped tin with some silver color beads and clasp. It is light in weight, identical on both sides, measures 21 inches, has a neat vintage look and lays best when arranged like a choker length necklace as the metal beads are somewhat fixed. The largest bead is 1 1/2" in diameter, the next size ones are 1 1/8" and last are graduated down to 1" then small beads, nice hook clasp. It has the look and feel of aged tin. The origin is unknown, please use photos as your guide