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This vintage plastic perpetual calendar features a classic red tartan pattern, a design popular in the 1970s and 1980s for functional retro home accessories. 
Design and Functionality
Perpetual Mechanism: Unlike standard calendars, these are designed for continuous use. The dates are printed on a long strip, and a sliding plastic window is moved manually to highlight the current day.
Display: It includes sections for the month (e.g., MAR), the specific date (e.g., 8), and the day of the week (e.g., FRI).
Material: Constructed from lightweight, molded plastic, with printed  numbers and letters.
Aesthetic: The red plaid or "Royal Stewart" tartan motif was a common theme for these retro "pop design" items. 
It measures 63.8cm in length and 4.6cm in width.
Similar vintage perpetual calendars from this era were frequently made in Hong Kong or France and are now considered collectibles for those seeking a mid-century modern or kitschy retro look.