Good morning, Joseph,

Thank you for contacting Mearto with your appraisal inquiry.
There's a good amount of history on York and Grand Rapids Band Instrument Company at this website: http://www.brasshistory.net/York%20History.pdf
The company was listed between 1911 and 1930.
Based on the photographs and information provided, and subject to examination, this is:

An American brass trombone
Made by Grand Rapids Band Instrument Company, probably circa 1920
Serial # 72539
Lacking case
$100-150*
*represents a fair-market value for auction purposes; retail or asking price may vary.

Please let us know if you have additional items to appraise, and thank you again for using Mearto.