Technical description: Glazed clay; 8 finger-holes and 2 thumb-holes; hole for R4 is double; metal tuning-slide attached to spherical handle.
Stamped in cartouche "E.MEZZETTI. Paris/ FABT. BREVETÉ S.G.D.G."; also roughly stamped with imprint of [coin or seal] containing two heads in profile and "[---]CIRCOLO[---]" and another stamped on top of this containing "E.MEZZETTI"; "B" or "6" stamped on body.
Performance characteristics: Gives scale of B.
Usable pitch: From sounding A⁴ = c 440 Hz to c50 cents below this pitch (c 428 Hz).