LOW PITCH & HIGH PITCH
Many historic instruments, especially wind instruments sold in the 1910s-1930s came in two separate pitch classes, Low Pitch and High Pitch.
Companies that commonly made Low & High pitch instrument include C. G. Conn and Buescher.
Low pitch instruments match our current understanding of orchestral pitch and are pitched to A=439 or A=440.
According to most academic sources the high pitch standard was set to A = 452.4 1)
Many claim High pitch instruments are pitched from A=456 to A=460, especially on saxophone forums 2)
This would mean high pitched instruments play almost a semitone sharp, but are still significantly flat for that pitch.
NOTES
This is a rather confusing setup and I have yet to find good concise information about what the two tunings were in an exact sense.
Expect this to expand to an essay when I know more information
