Vintage Gruen World Time-Teller cardboard calculator wheel designed to determine time zones across major global cities. This double-sided rotating disc features a yellow and blue color scheme with a list of international locations and their corresponding time offsets.

• Condition: Good (G)
• Brand: Gruen Watch Company
• Material: Printed cardboard/paperboard
• Origin: Printed in U.S.A.
• Features: Dual rotating discs with city-specific time pointers
• Design: Advertising for Irv Spritz jeweler in Danville, IL

Item will be packaged securely and shipped quickly to ensure safe arrival.

Keywords: horology, watchmaking, pan american airways, mid-century, ephemera, timezone, aviation, collectible, analog, travel

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