help I.D. oyster perpetual just date

[yooper]

hi, we have found a rolex oyster pepetual just-date. we are wondering how old it is ? it is marked between the lugs with brevet and the swiss symbol on one and the other is a 5 digit serial # 408**. dial has oyster-perpetual date just, 50m=165ft officially certified chonometer on it. i'm not sure of case material, possibly ss. the watch does not run at this time and does not have an original band.. any idea its value as parts ? would it be worth more restoring and sellings instead ? thanks for any input recieved ! yoop