Ultra-Rare Not-for-Sale Commemorative Item: NAMC YS-11 "Over 5,000,000 Total Landings" Liquid Crystal Tie Clip (1986 Vintage, with Original Case & Instruction Manual)

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This is an extremely rare, not-for-sale promotional novelty produced in November 1986 for industry insiders to commemorate the historic milestone of 5,000,000 total landings achieved by the entire fleet of the NAMC YS-11, Japan's iconic domestically produced airliner.

The back of the clip is engraved with the historic inscription: "OVER 5,000,000 TOTAL LANDINGS".

Key Feature: The Liquid Crystal is Still Alive and Working! This tie bar features cutting-edge 1980s technology: micro-encapsulated thermochromic liquid crystal that changes color dynamically according to temperature (16°C to 34°C / approx. 61°F to 93°F).

While almost all liquid crystal items from nearly 40 years ago have degraded and lost their color-changing ability, this piece remains fully functional. As shown in the photos, warming it with your finger triggers a vivid color gradient shift from dark/amber to vibrant emerald green and light blue (please refer to the 7th photo to see the color change in action).

Condition:

- Tie Clip Body: No major noticeable scratches; in very good condition for a vintage item from 1986.

- Liquid Crystal Sensitivity: Reacts smoothly and vividly to temperature changes.

- Included Accessories: Comes with the original plastic display case and the rare vintage instruction leaflet ("Liquid Crystal Accessories" temperature guide).

A true collector's piece for NAMC YS-11 enthusiasts, aviation historians, and lovers of 1980s retro-futuristic gadgets. Please review all photos carefully for details on condition and appearance.