Model, of Wedged Through Mortice and Tenon carpentry joint, with mortice aperture cut and open for Wedge (not present), joining two beech-wood blocks: stamped with ‘54’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868. This was constructed to fit (1868-31/22) Model, of beech-wood Wedge, with rounded ends, for Wedged Through Mortice and Tenon carpentry joint, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868.