Here is my recently acquired 1952 Nathan Airchime M5. This horn is from the Western Maryland Railroad and has a full restoration done by a fellow collector prior to me acquiring it. I did end up chainring it to 3/16” inlets on all 5 power chambers. This horn has had a lot of work done to restore it to operation. Really a cool one to have in my personal collection. Enjoy!
Air temp 53°F and 68% humidity at time of voicing.