Signedon top: ALTEC / LANSING / IMPEDANCE / 16 OHMS / SERIAL NO. 01057 / MODEL MR-902-16HF / HIGH FREQUENCY / LOUDSPEAKER / MADE IN USA
on plate in base: MANTARAY / CONSTANT DIRECTIVITY HORN
Inscribedstamped on side, black on black: 93104(missing)
Primary SourcesAltec Lansing, MR902-16HF High Frequency Constant Directivity Horn / Driver, spec sheets (Oklahoma City: Altec Lansing Corporation, 1986). downloadable here.