Flipclockfans | Trying to Whiten an Historic Copal 227 Flip Clock @Flipclockfans | Uploaded May 2022 | Updated October 2024, 1 hour ago.
This Copal 227 was purchased directly from Japan in extremely yellowed condition. We discovered that it was a specially "branded" clock intended to commemorate the 25th anniversary of the Copal Corporation on May 21,1974. Here we try to save this clock for Flip Clock History.

Thank you to FlipClockFans.com forum member
Engineer for the recommendations for lubricant and for use of the sun instead of a lamp.
See his website:
timerider.net

Inscription on the clock
創立25周年記念
株式会社コパル
昭和49年 5 月21日

Which translates to:
25th anniversary of foundation
Copal Corporation
May 21, 1974