I hope you can help me identify what the 4 stamps on the back of my watch mean. There are stamps on each lug. As I have lost my loupe I cannot read what they are and what they signify.It would be appreciated if someone could shed light on this for me. Also when watch is serviced will these stamps remain even after polising and replating of case?. And Finally Merry Christmas and a Happy New Year to all of you and your families.