At first appearance this is an heavy cardstock embossed die-cut chromolithograph Victorian greeting card that appears to open at center captioned “Gluck und Wohlergehen”.  c1880s.  Note the tabs at side.  When pulled outwards the center layer or curtain opens to review a die-cut ship scrap that moves across the page, as those sailing across the sea.  A scrap of a young girl stands at right waving it on.  When the tabs are pushed inwards the outer layer closes as the ship disappears to to the left.  Appears to have been printed in Germany.  Condition: light edge wear on corners of exterior; otherwise fine.  Mechanism in excellent condition.