Subtract the first 2 numbers of the serial number from 100, that is the year made. Unless the number from 1 is 68, 69, 70 ,71, 72 them that is year made
Myself I do not. A guy near me may know. Check out the Cumberland Outdoorsman RU-vid. He recently made another episode regarding the model 60. Ask him he may know.
If it doesn't have a screw, I'm not sure. Far one has a screw best I remember I think. You might try asking Tom on the Cumberland Outdoorsman youtube channel. He does alot with those model 60s.
@liljimitwofeatherz9735 not sure. Go to the Cumberland Outdoorsman on RU-vid and ask Tom. He knows alot about the model 60s. They are a subject he's decussed alot.