Tuning of Orchestra across the globe

The above clip showed the recording of the opening chords of Beethoven's third symphony played by different orchestra across the century.

You might have noticed that orchestras from the America in the early 20th century used lower tuning than orchestras in Europe and orchestra from Germany used a higher tuning, especially for Berlin Phil.  For your information, in 1939, an international conference recommended that the A above middle C be tuned to 440 Hz, now known as concert pitch.

Many orchestras in the UK and the US adhere to this standard as concert pitch. However, not all the orchestra follow the standard. New York Philharmonic use A = 442 Hz. Most of the orchestras in Germany and Austria use the tuning A = 443 Hz.