The value of a Singer sewing machine model 66 depends on several factors, including its condition, age, rarity, and any included accessories or attachments. Here's a general price range for this model:
- Fair condition: $100 - $250
- Good condition: $250 - $400
- Excellent condition: $400 - $650
Keep in mind that prices can vary widely depending on specific circumstances and market conditions. It's always a good idea to get an appraisal from a professional or check online marketplaces for recent sales data to determine the current market value of a particular Singer sewing machine model 66.