Boehringer 288 0.62 g n.v. JEAN ELSEN s.a. Auction 53 (March 1998) no. 574
III. Gruppe Reihe XI Boehringer 286-291 (288)
Reihe XII Boehringer 362-370 (366, 368)
on account of Boehringer's images assignment to a particular "Reihe" is difficult