NIKON NIKKOR 20mm 1:3.5 #194757 CAMERA LENS Made in Japan

Have no knowledge of cameras or equipment.....please see all pictures. Do not know how to test, etc.
Around lens reads: "Nikon" "Nikkor" "20mm" "1:3.5" "194757" The piece is stamped: "Made in Japan"
Lens is used but appears to be in very good condition. No scratches seen. One lens cap is included.