The National Bank of Romania decided to produce some means of payment for the monetary reform of 1947 in secrecy. The Czechoslovak National Bank (NBČS) executed a perfect graphic appearance for the banknote of 100 lei based on a drawing by a Romanian painter. The bank produced printing forms for offset processing and printed 12 series from the June issue. Bucharest was provided with the watermarked banknote paper for another 30 million of bills as well as printing forms and numbering machines. Later on, the bank produced printing forms for the letter-print and delivered them together with 50 new numbering machines for the purpose of the December issue. The author is focused on various phases of this cooperation as well as on the connection among watermarks, series, numbering machines and issues of this sole Romanian banknote, in which the NBČS’ printing office was involved in a decisive way. The author mentioned also mintage of the 2-lei coin in the Kremnica mint in 1947.