BEHOO

• Production era - 1935-1959
• Type - Adjustable extension legs and clamping ring for Elmar (I) f= 5 cm 1:3.5, Elmar (II) f= 5 cm 1:3.5 or Summar f= 5 cm 1:2 , with stops and markings for 1:1, 1:1.5 and 1:2 used as copy stand or for measuring distance and size for close-up work.
• BEOOY - is similar with longer legs.
• Reference - Page 43 of Dennis Laney's Leica 1984 Accessory Guide courtesy of Mike Butkus