This is a very interesting and uncommon puzzle by Jumbo. The title is Pastel Flowers, by Eduard & Maria van Koolwijk.
The puzzle is COMPLETE (1500 pieces). The pieces are in excellent condition. The box is in very good condition, except for a couple of small tape tears on the sides of the lid.
It measures 60 x 90 cm, 23.5″ x 35.5″. The reference number is 1720.