I came across some Martin instruments in the Holton Factory Reference Collection. Several are unmarked, and most are believed to be prototypes. A couple are marked "RMC" for Roundtable of Musical Craftsmen, though commonly known for the Richards Music Corporation. 

The Martin Band Instrument Co.

NMM 13,830 Euphonium in Bb. Serial number 203640. Prototype Upright Euphonium attributed to The Martin Band Instrument Co. 1957. Length 2623 mm. Holton Factory Reference Collection. 

NMM 13,807 Tuba in BBb. Attributed to The Martin Band Instrument Co. Serial number 194098. 1955. Prototype. Length 5252 mm. Holton Factory Reference Collection. 

NMM 13,797 Sousaphone in Eb. Serial number 215607. Model SU 30. 1962-1963. Length 3912 mm. Holton Factory Reference Collection. 


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NMM 13,794. Sousaphone in BBb. Serial number 211711. Model SU 05 Medium BBb Sousaphone. 1961. Engraving includes "RMC" for "Roundtable of Musical Craftsmen." Holton Factory Reference Collection.  


IMAGE NOT AVAILABLE

NMM 13,801 Recording Bass in BBb. Serial number 209999. Model TB 03 BBb 3-valve bass. 1960. Length 5343 mm. Holton Factory Reference Collection. 


IMAGE NOT AVAILABLE

NMM 13,821 Euphonium in Bb. Serial number 137470. Model Recording Baritone Single Bell. 1940-1941. Holton Factory Reference Collection. 

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