I think I have finally got a comprehensive list of the codes Citizen used for their case materials up to the late 1970s. There are rather more than I originally expected! And it’s possible that more were used than I have so far found, so please get in touch if you have information that I can add to the following table. Some of the codes are obscure and rare – I have yet to see quite a few of these ‘in the wild’. I have verified the codes from original Citizen casing manuals, catalogues and adverts, as well as a few that aren’t in any of those sources but are on the back of my own watches.
I hope I have described the codes correctly, bearing in mind that I have used a translator. Where the translation is unclear I’ve added a ‘?’ in the description. Please feel free to ask questions if you have any queries.
| Code | Full Description | |
| A | AEGP30 | All Especially thick Gold (30 microns) Plated case |
| AGF | All Gold Filled case | |
| AGWF | All White Gold Filled case | |
| ARHF | All Rhodium Filled case | |
| ASVP | All Silver Plated case | |
| α | α – GP or AA-GP | ‘alpha’ (23K) special gold plated case |
| B | BL | Black (case and bezel) – hard & light black coated alloy |
| BLG | Black coated alloy case, Gold bezel | |
| BLG-K | Black coated alloy case, Gold bezel, with exhibition back | |
| BLHS | Black coated alloy case, (stainless) super Hard Steel bezel | |
| BLIG | Black coated alloy case, mirror polished titanium nitride gold bezel | |
| BLPD | Black coated alloy case, palladium plated bezel | |
| BLRG | Black coated alloy case, Rose Gold bezel | |
| BLS | Black coated alloy case, (stainless) Steel bezel | |
| BLTI | Black coated alloy case, Titanium carbide bezel | |
| BLUA | Black coated alloy case, (stainless) Ultra hard Alloy (carbide) bezel | |
| BLUG | Black coated alloy case, (stainless) Ultra hard alloy Gold (carbide) bezel | |
| C | CCP | Citizen special thickness Chrome Plated case and bezel |
| CGP | Citizen special thickness Gold Plated case | |
| CGPA | Citizen special extra thickness Gold Plated case | |
| CL | Citizen L? , jewel case – possibly glass case | |
| CRPG | Chrome Plated case, Pink (rose) Gold bezel | |
| CSP | Citizen Special (stainless) Steel Plated | |
| E | EGF | Especially thick Gold Filled |
| EGP30 | Especially thick Gold Plate, 30 microns | |
| G | GF | Gold Filled |
| GL | G? L?, crystal glass case | |
| GP | Gold Plated | |
| GPB-K | Gold Plated case, Black bezel with exhibition back | |
| I | IG | I? stainless steel case with titanium nitride (i.e. Gold colour) coating, mirror finish |
| IGG | I? stainless steel case with titanium nitride (i.e. Gold colour) coating, mirror finish, Gold plated bezel | |
| J | JA | Jewelry Agate, polished agate case |
| K | K14 | 14Karat solid gold case |
| K14WG | 14Karat solid white gold case | |
| K18 | 18Karat solid gold case | |
| K18WG | 18Karat solid white gold case | |
| N | NGF | New Gold Filled case |
| NWGF | New White Gold Filled case | |
| P | PDP | Palladium Plated case |
| PM | solid Platinum case | |
| PMF | Platinum Filled case | |
| PMP | Platinum Plated case | |
| R | RHF | Rhodium Filled case |
| RHP | Rhodium Plated case | |
| RN | synthetic Resin case | |
| RN-P | synthetic Resin case with exhibition back | |
| RSGP | Rose Gold Plated case | |
| S | SHA | Super Hard Alloy case |
| SHS | Super Hard stainless Steel case | |
| SLV | solid Silver case | |
| SLVGP | solid Silver case, Gold bezel | |
| SS | Stainless Steel Case | |
| SSα | Stainless Steel case with ‘alpha’ 23K gold bezel | |
| SSB | Stainless Steel case with Black bezel | |
| SSG | Stainless Steel case with Gold bezel | |
| SSIG | Stainless Steel case, with I? titanium nitride (I.e.Gold colour) mirror finish bezel | |
| SSS | Special Stainless Steel case | |
| SSTI | Stainless Steel case, Titanium carbide bezel | |
| SSUA | Stainless Steel with Ultra hard Alloy (carbide) bezel | |
| STAINLESS STEEL | stainless steel case | |
| SVGP30 | Solid Silver case, Gold Plated 30 microns bezel | |
| T | TGP | Top Gold Plated |
| TI | Titanium carbide (ultra hard alloy) case | |
| TN | Titanium Case | |
| U | UHA | Ultra Hard Alloy (titanium carbide) case |
| UHAG | Ultra Hard Alloy Gold (titanium nitride) case | |
| UHBC | stainless steel case with Ultra Hard Black Coating, mirror polished? | |
| UHC | Ultra Hard Ceramic case | |
| W | WD | Wooden case |
| WGF | White Gold Filled case | |
| WGP | White Gold Plated case | |
| WGPA | White Gold Plated All case, and back? | |
| WGPG | White Gold Plated case, Gold bezel |
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