Hitlerjugend (HJ) buckle.
On the back marked with RZM “72”. While many attribute this buckle to maker Wilhelm Deumer, it is actually an early RZM buckly from around 1936 made by Paul Cramer (who later got a different rzm number).
Nice original buckle in actualy worn condition. Definately heavy worn and NOT for any monit collectors. But if you need a worn piece it’s a great buckle!