Swiss Large One-Button Chronograph WWI German Military in Solid Silver with Porcelain Dial c.1910's

The first one button chronograph wrist watch was advertised in 1910 and this big 40mm .800 silver German hallmarked early example is very beautiful and in wonderful condition. White porcelain dial with sunken sub dials for constant seconds and accumulated chronograph minutes, outer tachymeter register in red and another register from 0 to 300 in blue. Dial condition is excellent with only one very faint hairline and one fleabite under the bezel. Original blued steel skeleton hands. Original gold onion crown and chronograph pusher. Solid .800 silver hinged case is hallmarked with the Swiss grouse and the German  crown and quarter moon. Measuring a very large 40mm X 45mm X 12mm, the case is excellent with good hinge and snug covers. Engraved unknown symbol on case back. Inside is the original high grade 15 jewel Swiss movement that is clean and correct with all time and chronograph functions operating as they should, having just been serviced by us. Glass crystal is clean and clear. We have put a new 1 inch wide custom made cuff strap that is period correct and beautiful on this big military chronograph.