4 school chairs with tapered metal and wood legs

Set of 4 school chairs in metal and wood. Production from the 60s and 70s. Nice design thanks to the tapered legs which give a more slender style to these usually classic chairs. In good condition, and solid. Note normal wear and tear from the passage of time and use (traces of rust), which gives a good industrial look. Some foot tips are new. Seat height: 43cm. Marked under the base with the serial number, ending in 72, perhaps the year of manufacture.