I am selling my Sinn 556i rs. the leather strap has been replaced with a new calfskin strap with white stitching by Hirsch - one of the official strap providers used by Sinn. I can include the original strap if wanted. the original buckle with the Sinn logo is attached. The case is in excellent condition with no visible scratches to it or the sapphire crystal. Box and papers all included as from new. originally purchased from CW Sellors in Whitby, an official Sinn UK dealer. if you have any questions feel free to ask.
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