Age and valuation of Armstrong student flute

[lynnbery]

Parents bought new Armstrong student flute in late 1950s. The number 100 appears below the name band, and the number 335 appears on the head piece above the cap. Armstrong's serial number list is not helpful. I'd like any further details about it, including approximate valuation. The condition is very good with pads replaced about 10 years ago and not played since. Been kept in the original brown hard plastic case.