How can you find out about the worth of a Hohner Stradivarius piano accordion?

To determine the worth of a Hohner Stradivarius piano Accordion, research recent sales of similar models on platforms like eBay, Reverb, or specialized musical instrument auction sites. Consult vintage accordion appraisers or local music shops that specialize in accordions for expert evaluations. Additionally, check online forums or collector groups for insights on market trends and pricing. Finally, consider the condition, age, and any unique features of your accordion, as these factors significantly influence its value.