@Feldbegeher: die Schnalle ging über den ganzen Spann des Fusses. Vgl. auch die Schnallen bei Marshall:
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Einlogenhttp://www.ukdfd.co.uk/ceejays_site/pages/bucklepage20.htm
Text dazu: SHOE BUCKLE SHAPE AND SIZE - a general guide only as there are obviously some exceptions to the rules.
Square - under 2 inches are early-18th century, over 2 inches are after 1760.
Rectangular - 2-2½ long up to 1760, increasing to very large (up to 4 inches (=10 cm)) long) from the 1770's.
Oval to round - 2-3 inches are more common from the 1750's.