| Sub-brands: | 
                    
                          SQ, 
                        
                    
                          Silverwave Z, 
                        
                    
                          Silverwave, 
                        
                    
                          Type II
                        
                    
                     | 
                  
                  
                  
                    | Battery: | SR43SW / 301 (Silver oxide)
                      
                     | 
                  
                  
                  
                    | Accuracy: | ±15 seconds/month | 
                  
                  
                  | Day / date? | Day + date | 
                  
                  
                  | GMT / world time? | No | 
                  
                  
                  | Chronograph? | No | 
                  
                  
                  
                  
                    | Rate: | 32,768 Hz | 
                  
                  
                    | Number of jewels: | 4 | 
                  
                  
                  
                    | Size / diameter: | 27.0mm | 
                  
                  
                    | Height: | 4.6mm | 
                  
                  
                  
                    | Development division: | Suwa (Nagano Prefecture, Japan) | 
                  
                  
                    | Notes: | The same as cal. 7545 but with day display (as well as date). Has a battery life indicator function where the seconds hand moves in two-second intervals when the battery is running low. | 
                  
                  
                  
                    | Related movements: | 
                      
                    
                        7518 
                    
                        7545 
                    
                        7548 
                    
                        7549 
                    
                        7559 
                    
                     |