| Year | 1929 |
| Date | 04-Jul |
| Volume | 61 |
| Issue | 1,469 |
| Page | 3 |
| Category | Horology |
| Part | |
| Title | A Locking Frame Calendar |
| Author | Dr. Bradbury Winter |
| Notes | In its case, lever in normal or vertical position, pulled into "over" position, back view, part of interlocking gear, showing how bell rings when setting of calendar has been forgotten, catch weight |