I need a case back for my expedition world time watch. I don't know the model number but it has a heavy leather band with nylon edging, a brownish grey dial with a blue fourth hand and blue symbols at the four cardinal headings. The 12 and 24 on the inner bezel are blue. The movement is a miyota 6M17.I got the watch in a parts or fix lot on eBay. I put a new movement in and cleaned it up. It looks great and I would love to wear it but I have no back. Please help if you can. I think this is the best looking watch Timex ever made.