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Bore .504" - .531" bore = 12.
8 - 13.
5mm.
Yellow brass bell: Ø 8 3/8" = 211mm.
Gold brass leadpipe.
Nickel silver outer slides.
3 top-action valves.
Stainless steel pistons.
Original VINCENT BACH 12C mouthpiece and valve oil.
Light weight case with rucksack assembly.
Clear lacquer finish.