I'm freshening up an older Seiko 6309-8679 I found in a drawer at home. I've got it disassembled and need to find a new crystal for it. Can anyone tell me what part number would be correct for a new crystal? I see many on e-Bay and they are all a confusing series of long part numbers. Also, the number dial/face on mine is loose and rotates around. Is it held on with adhesive or screws? I'm new to this and am very excited about trying to repair some old watches I found. Thanks for listening!!