I'm curious to know if the wooden 'box' with "RAND" caved upon it is the case for your cool little flute , brickharbor ?
... if so , I'd give a solid guess that 'rand' was an identifier of a former owner of the instrument , esp since the carving 'appears' as it does (somewhat primitive/off-center hand carving) ... perhaps a 'school' logo/crest/etc. ....