| Year | 1920 |
| Date | 28-Oct |
| Volume | 43 |
| Issue | 1,018 |
| Page | 343 |
| Category | Horology |
| Part | |
| Title | Precision Lever Watches |
| Author | |
| Notes | Ditisheim precision lever watches - for longitude determinations, explorer's outfit, in box for use on torpedo boats & other vessels subject to violent oscillations, in hermetically-sealed soft iron box for geodic & astronomical expeditions |