Follow up : thanks for any help guys you really are the best!! Serial number : 48232*** what year? Watch has some signs of corrosion on pushers . Is it bad ? Watch has very nice patina and seems in good shape. Hasn't been serviced for 20 years but works well. Should I buy or stay away from this one for 3500$ Last important question: in speedmaster 101 it says that serial number 48****** May be a replacement movement , could that be the situation here? Regards Mit