Early aluminum hardware, hidden stitch Y-strap marked gmk41

Hard to find first model Y-strap with hidden stitches on the front and aluminum hardware. Nicely marked gmk 41 indicating production by Kroymann & Co. GmbH , Schuh- u. Sportartikel-Fabrik in 1941. Early Y-straps with hidden stitch construction and aluminum hardware are only scarcely encountered.