A VERY RARE POCKET STERESCOPE  FOLDING GERMAN ,WE THINK , THERE ARE 28 VIEWS ALL GERMAN WITH A ZEPPELIN & GERMAN CRUISER& 2 OF A PROPOSED ROUTE OF THE PANANMA CANAL   PLUS OTHER VIEWS AS PHOTOS  VIEWE OPERATES WITH GOOD OPTICALCONDITION. VIEWER IS SOUND IF A LITTLE DELICATE DUE TO IT S AGE WILL GRACE ANY COLLECTION SIZE FOLDED  4 1/4"  X 1  1/2 "  ANY QUESTIONS PLEASE ASK THANK YOU FOR LOOKING .WORLDREELS .