Most likely this model disassembles one of two ways.
Let me preface this response with saying that it is best to have a professional Certified Master Horologist do this repair, as it can be difficult to keep parts intact in the process.
If you see slits in the end of the pins that hold the band on, you need to use sharp, proper size watchmaking screwdrivers on each side. It can be difficult to do this alone, without a device to hold the pin in place while in the process.
The second method is: if there is no **** for a screwdriver (it is smooth like a button), it is a pressure pin configuration. It is one complete piece on one side going all the way through the band, and the other side is held in place by a small rivet that is the same style and appearance that goes into the other side. This can be removed by holding one side in a vise device, and pulling the other with special needle nose pliers, or placing those pliers on the inside of the "button" rivet, and tapping the pliers with a mallet.
You would then replace the band and:
A) Use two screwdrivers to thread the screw back in to one side
OR
B) Tap the button rivet back in to place with a mallet and anvil.
Answers & Comments
Most likely this model disassembles one of two ways.
Let me preface this response with saying that it is best to have a professional Certified Master Horologist do this repair, as it can be difficult to keep parts intact in the process.
If you see slits in the end of the pins that hold the band on, you need to use sharp, proper size watchmaking screwdrivers on each side. It can be difficult to do this alone, without a device to hold the pin in place while in the process.
The second method is: if there is no **** for a screwdriver (it is smooth like a button), it is a pressure pin configuration. It is one complete piece on one side going all the way through the band, and the other side is held in place by a small rivet that is the same style and appearance that goes into the other side. This can be removed by holding one side in a vise device, and pulling the other with special needle nose pliers, or placing those pliers on the inside of the "button" rivet, and tapping the pliers with a mallet.
You would then replace the band and:
A) Use two screwdrivers to thread the screw back in to one side
OR
B) Tap the button rivet back in to place with a mallet and anvil.
I hope this helps you!