Antique Vtg KAHLENBERG Steam Whistle Train Railroad

I do not know much about Steam Whistles. I did find, however, that KAHLENBERG is a very old company with a history in Railroads. Whistle appears to be Bronze (I see a pink cast) or Brass (magnet will not ad and has never been polished and tby has original patina. Whistle measures 8-6/8" long. Whistle comes with a 2-1/4" threaded steel nipple and brass adapter near bottom which when added means the whistle will measure 11-5/8" long. I wrapped tape around long cylinder and measures 5" round. 1/2" inlet hole. This Steam Whistle is heavy ~ weighs a tad under 2-3/4 lbs! Condition is VERY GOOD VINTAGE.