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MoHMA Stethoscope, Traubes 6 5/8 long with 1 7/8 earpiece and 1 3/16 chest piece. The wide tube is 5 /16 and the narrow tube is 1/4. The whole being telescoping. It is made of nickle plated brass. There is a mark under the chest piece which resembles the G cleft key, possibly Kny Scheerer but more likely another mnfr. https://www.mohma.org/instruments/category/stethoscope/stethoscope_traubes/