this is what Google AI Overview said (Take this with a grain of salt. Google AI sometimes draws from questionable sources and is not to be trusted but can be a starting point. In this case GAI’s source seems to be Etsy):
“Authentic 1940s Howard Johnson’s restaurant dishes (specifically Syracuse or Mayer China) are collectible, typically valued between $10 and $50+ per piece, depending on condition and pattern. Items featuring the "Simple Simon and the Pieman" logo or bright orange accents are the most desirable, with complete, pristine sets holding the highest value.
Key Factors for Value:
The "Pieman" Logo: Dishes depicting the Simple Simon character are highly prized.
Manufacturer: Look for markings on the back from Syracuse China or Mayer China, which often produced for them.
Condition: Pieces with minimal wear (no cracks, chips, or faded graphics) are worth more.
Item Type: Small plates, saucers, and specialty ice cream dishes are common, but matched sets bring higher prices.
Common Valuation:
Single plates/saucers often sell in the $10–$25 range on platforms like Etsy.
Sets of 6–10 items can sell for over $100.
Items from this era are recognized as significant American diner "Americana" memorabilia, largely due to the brand's iconic 1940s expansion and distinctive, branded tableware.”
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Sorry, no Worthpoint subscription here. Good luck with your treasure hunt!