This watch was my fathers and has been sitting in his briefcase since 1976 except for coming out from time to time. My wife and I opened the case and found the following numbers 7512 over 651338. On the movement is K818/CW and 748678. The band and case are all 14K. The face only says LeCoultre which is centered under the '12'. Can you tell me about when it was made and what it might be worth. This is the best picture I could muster. Thanks in advance.