1973 Rembrandt/Picasso Note Printing Australia Test NoteBanknote producers create three types of test notes: 1. Promotional Currency Notes to showcase tech and security 2. ATM Test Notes for note acceptance 3. Durability Test Notes for quality checks This NPA Securency Test Note features Rembrandt Harmenszoon van Rijn, usually simply known as Rembrandt on one side with Pablo Picasso on the other. The distinctly unfinished reverse, sparks intrigue. It may have been used to test the blue window's durability.