NBS-ZIN Test Note Barilli; Polymer

Test notes of this type were produced by ZIN — the Serbian state security printer — to evaluate polymer substrate behavior under local printing conditions. By 2005, the global shift toward polymer banknotes was well underway following Australia's lead in the late 1980s, and several European state printers were running internal trials to assess whether their existing intaglio and offset equipment could be adapted. The "Barilli" designation likely references an internal project or substrate supplier code rather than a public issue name.

Never intended for circulation. Surviving examples exist almost exclusively through printer archives or specialist collectors who obtained them through official channels.