| A | |
| AOC | Mido Roamer (Meyer & Stüdeli) |
| AOG | Ch. Aerni S.A. |
| AOH | Hamilton |
| AOI | Doxa |
| AOL | Doxa Adolph Schwartz & Son |
| AOX | Alstate Watch Co., Alstater Watch Corp. |
| AXA | A. Wittnauer & Co. |
| AXF | Abercrombie & Fitch Co. |
| AXG | Avon Watch Co. |
| AXJ | A.R. & J.E. Meylan Meylan Stop Watch Co. |
| AXP | Aristo, Ed. Kummer, Ebauche Bettlach |
| AXR | Mural Watch Co. |
| AXU | Lucien Piccard Paul Ditisheim S.A., Solvil & Titus |
| AXZ | Alden, Benrus, Langendorf |
| AYP | Audemars Piguet |
| B | |
| BOL | Bernard S. Lipmann, Lemania, Octo |
| BOM | Berman Watch Co. Inc. |
| BOP | Robert Ronnel |
| BOW | Breitling |
| BXC | Avia Degoumois & Cie., Ball |
| BXJ | Midland |
| BXL | Lion |
| BXN | Benrus |
| BXP | Glycine, Imperial, Norwich, Bayer, Pretzfelder & Mills Ulysse Nardin |
| BXU | Eickmann & Co., E. Baumann, Aristo Imports Inc. |
| BXW | Bulova |
| BXY | Charles Arbrecht |
| BYF | F.T. Bishop Inc. |
| BYM | Michael Z. Berger |
| BZK | Berci Inc. |
| BZM | J.C. Penny Towncraft |
| C | |
| COC | Crawford |
| CON | Charlin Watch Co., New York |
| COR | Cornell, Orloff |
| COT | Tavannes Watch Co. SA, Cyma Watch Watch Co. |
| COW | Croton |
| COY | Cyma |
| CXC | Concord |
| CXD | Cypres (Erwin Triebold) |
| CXH | Clinton, Avis Watch Factory |
| CXJ | Central |
| CXL | Leonidas |
| CXM | Clinton, Wolbrook, Circle Watch Corp. |
| CXV | Cort, Cortebert |
| CXW | Central, Benrus |
| CXY | Croydon |
| CYW | Chesterfield Watch Co. |
| CZA | Canoe |
| D | |
| DOB | Dreffa Watch Co. |
| DOW | Deauville (Ollendorf Watch Co.) |
| DWQ | Langendorf, Lanco |
| DXC | Crawford |
| DYR | Den-Ro, Bernard Vuille, Tramelan |
| E | |
| EOE | Elrex, Pierpont |
| EOM | Emo Watch Co. |
| EON | Avalon, Calvert |
| EOP | Alpina, J. Straub & Co. Harvel, Rensie |
| EOT | Lavina |
| EOY | Compass Instruments & Opticals |
| EXA | Eterna |
| EXC | Everbrite |
| EXM | Savoy, Milos |
| EXG | E. Gübelin, Luzern, Zürich, New York |
| EXN | Breitling |
| EXO | Empire |
| EXW | Empire Watch Co. |
| EYH | Mulco |
| EZR | Enicar SA |
| F | |
| FON | Fewa Watch Co. New York |
| FWR | Amko Watch Co. |
| FXE | Provis |
| FXF | Fairfax (Gruen) |
| FXU | Louis Aisenstein and Brothers Roamer, Meyer & Stüdeli |
| FXW | Louis |
| FYG | Eloga Watch Co. |
| FYL | Dreffa Watch Co. |
| FZB | Benfre |
| G | |
| GOC | Crawford, Rexton |
| GOG | Greygor, Hoga |
| GOU | Goma Jewelry Manufacturing Co. Inc. |
| GXC | Gruen |
| GXI | Gotham (Ollendorf Watch Co.) |
| GXL | Fortis |
| GXM | Girard-Perregaux, Mimo |
| GXR | Grant, Emil Braude & Sons |
| GXW | Gothic Watch Co. |
| GYH | Hilton |
| GYP | Global Watch Co. |
| GZR | Grenzler Lee |
| H | |
| HOB | Jackson Watch Co., Wakmann |
| HOM | Homis |
| HON | A. Hirsch, Chs.Tissot & Fils Universal Genève |
| HOP | Hall |
| HOR | Lanco Langendorf |
| HOU | Oris |
| HOX | I.W.C. International Watch Co. |
| HXF | Harman |
| HXH | Harvel |
| HXL | Easton |
| HXM | RH Macy & Co. |
| HXN | Harvel |
| HXO | Harold K. Oleet |
| HXW | Helbros, J. Boillat Fils |
| HYL | Hamilton |
| HYO | Hilton |
| HYQ | Hilton |
| HYW | Harper |
| HZE | Hetega |
| I | |
| IXL | Eterna |
| IXK | Pilgrim Electronics |
| IXO | Ollendorf Watch Co. |
| IXW | Certina, Kurth Freres |
| J | |
| JXE | Normandie Watch Co. |
| JXJ | Jules Jürgensen |
| JXL | Le Phare SA, Sultana SA |
| JXR | Gallet, J. Racine Co. |
| K | |
| KBH | Endura |
| KBU | Baume & Mercier |
| KOT | Max Landau & Co. Inc., New York |
| KXA | Astin Watch Co. |
| KXB | Ernest Borel |
| KXF | Zodiac, Clebar |
| KXJ | William J Kappel |
| KXO | Blancpain, Rayville Watch Co. Ltd. |
| KXV | Louis |
| KXZ | Benrus, Central, Kelton |
| KZX | Rutex, J. Weber, Sellita |
| L | |
| LBA | Ollech & Wajs |
| LOA | Emil Lange |
| LOD | Latham |
| LOE | Enicar, Packard, Delbana |
| LON | Lorna Warch Co. |
| LOT | Lathin |
| LOV | Creation Watch Co., Levrette |
| LOY | Benrus, Lathin |
| LXA | Elbon, Langendorf, Lancet, Winton |
| LXE | Evkob |
| LXJ | Jaeger LeCoultre, LeCoultre |
| LXM | Accro Watch Co. |
| LXW | Longines |
| LYE | Aureole |
| LZF | Joseph Laufer |
| LZL | Henry Gireaux Watch Co. |
| M | |
| MOG | Avia, Degoumois & Cie. M.A. Mead & Co., Boulevard |
| MOK | Montauk Watch Co. |
| MOU | Delbana, Tower. Buttes Watch Co. |
| MOV | Marvin |
| MWS | Le Jour Time Co |
| MXC | Marshall |
| MXE | Deleware, Monarch |
| MXF | Harman |
| MXH | Seeland |
| MXI | Movado |
| MXT | E. Mathey-Tissot & Cie. |
| MXU | Zimet Watch Co. |
| MYU | R. Lapanouse S.A., Rego Watch |
| N | |
| NGH | Universal Genève |
| NJD | Nastrix |
| NOA | Ulysse Nardin |
| NOG | Enicar, Kuper Watch Co. |
| NOH | Heyworthy, A. Hirsch |
| NOK | Pilot, Ralco |
| NOS | Amida SA, Heritage, Defender |
| NOU | Louvic, Hoda Vulcain, Ditisheim & Co. |
| NWX | Charles Gigandet, Tramelan |
| NXJ | National Jewellers Co. |
| NXO | Oris |
| NXS | Popper Watch Co. |
| NYN | Conoseur Watch Co. |
| O | |
| OWT | Caravelle |
| OXG | Omega |
| OXL | Paul Wyler & Co. |
| OXY | Artis |
| OYM | Cromwell |
| OYT | Sandoz, Shiro |
| P | |
| POB | General Watch Co., Helvetia |
| POF | Aureole Watch Co. |
| POH | Perfine Watch Co. |
| POX | Lucerne, Wega |
| POY | Camy (Stroun Freres), Copley |
| PWY | Spera |
| PXA | Pierce SA |
| PXP | Patek, Philippe & Co. |
| PXT | Paul Breguette |
| PXW | Parker Watch Co. |
| PYC | Pedre |
| PYS | Langel |
| Q | |
| QXL | Emerson, Lauret |
| QXO | Kelbert |
| QZY | Onsa, Nileg, Hans Jörg Gilomen |
| R | |
| RBZ | J. P. Pingouin Co, Hunsberger & Cie |
| ROC | Raleigh |
| ROD | Regent |
| ROH | Calbert |
| ROL | Ribaux |
| ROM | Avia, Belvue, Reyco, E.W. Reynolds Co. |
| ROP | Rodania |
| ROR | Audemars Piguet |
| ROT | Rodania |
| ROW | Rolex, Tudor |
| RXB | Consolidated |
| RXE | Brenet |
| RXG | Olympic, Zodiac, R. Gsell |
| RXM | Galmor |
| RXU | Roamer (Meyer & Stüdeli) 1952 |
| RXV | Juvenia |
| RXW | Rima Roamer (Meyer & Stüdeli) |
| RXY | Gala, Liengme & Cie. |
| RXZ | Benrus |
| RYW | Ritex |
| S | |
| SOA | Felca, Felca & Titoni, Siduna |
| SOE | Semca (Louis Schwab) |
| SOL | Stuart |
| SON | Defender |
| SOW | Invicta, Seeland |
| SOX | Cortbert, Orvin Watch Co. |
| SWU | Semag, Alben |
| SXA | Nivada |
| SXE | Banner, Savoy |
| SXK | Eska Sylvan Kocher & Cie. |
| SXS | Franco |
| SXU | Segut Watch Co. |
| T | |
| TOB | Pronto |
| TOC | Capt & Cie. |
| TOH | Banner, Rivera |
| TXJ | Latham |
| TXY | Tourneau Watch Co. |
| TXW | Tavannes Watch Co. SA, Cyma Watch Watch Co. |
| TYW | Elgin, Seth Thomas |
| TYX | Trebex |
| U | |
| UOA | Actua |
| UOB | Aero |
| UOR | Rado |
| UOW | Universal Geneve |
| UWP | Palmer Sales Co. |
| UXM | Medana, Meyer & Stüdeli |
| UXN | Marsh |
| UXO | Wega |
| UYN | Mantab Watch Co. (C. Ruefli-Flury & Cie.) |
| UYW | Stanley Watch Co. |
| V | |
| VOA | Ventura, Assaels |
| VOB | Grana, Kurth Freres |
| VOS | Sheffield, Voumard Jenco Watch Ltd. (Jenny & Frey SA) |
| VXB | Chase, Hamilton, Louis |
| VXN | Vacheron & Constantin, LeCoultre |
| VXO | Transit |
| VXT | Kingston, Hilton |
| VXX | Libela |
| VYE | Benrus |
| W | |
| WOA | Tower |
| WOB | Wyler |
| WOG | Breitling |
| WOR | Creston |
| WXC | Buren |
| WXE | Welsbro |
| WXJ | John Wanamaker |
| WXO | Waltham |
| WXW | Westfield |
| WXZ | Breitling |
| WYX | Continental, Harvester |
| X | |
| XOU | Pronto Watch Co. |
| XOV | Endura (Gaston Ries) |
| XXZ | Kelton |
| XYG | Westclox |
| XYH | Alpha |
| XYV | Hampden |
| Y | |
| YOA | Perfecra Watch Co. |
| YOU | Hallmark Watch Corp (Louis Aisenstein & Bros, New York) |
| YXD | Crysler, Lucerne |
| YXY | Elgin |
| Z | |
| ZBH | Mondaine |
| ZFX | Zenith |
| ZOA | Baylor |
| ZOB | Belvior, Evans |
| ZOK | Telda |
| ZOV | Titus, Paul Ditisheim S.A. |
| ZXW | Benrus |
| ZYB | Hawthorne Watch Co. |
| ZYV | Hampden |