Original Ruitertassen tuck lock. Made for the following satchels made up to 2013 included:   Student I (xx2103) Professor I (xx2131) Professor II (xx2133) Scholar II (xx2137) Professor III (xx2139) Student II (xx2140) Doctor Briefcase (xx2403) Doctor Briefcase (xx2437)   For identification purposes, the metal rotating tube is 1.18″ long (SM version). If in doubt of which tuck lock is suitable for your Ruitertassen, please don’t hesitate to get in touch. A note for US customers: On orders under $189, import duties are charged before delivery – typically around 30 / 40% of the order value. On orders of $189 or more, we cover all import duties. Nothing extra to pay.