Core Viewpoint - The current circulation of the Renminbi is primarily the fifth series, with previous series mostly withdrawn from circulation, and the fifth series includes different versions based on the year of issuance [1] Group 1: Currency Versions and Market Dynamics - The fifth series of Renminbi consists of the 1999, 2005, and 2019 versions, with the 2019 version further subdivided by year [1] - The 1999 version of the 50 yuan note has become a "currency king," with special serial numbers like "Tiger" (five identical last digits) and "Elephant" (six identical last digits) selling for prices around 300 to 400 yuan, while other special serial numbers like "Leopard" and "Lion" can exceed 600 yuan [3] - The market for purchasing these notes is currently very weak, with few buyers for ordinary serial numbers, and only a limited number of dealers interested in special serial numbers [5] Group 2: Pricing and Collectibility - The ordinary 1999 version of the 50 yuan note is now considered face value, with selling prices around 100 yuan, reflecting a decline from previous values [6] - Despite being the least issued note in the fifth series, the 1999 version has a relatively high surviving quantity due to its short issuance period and the growing awareness of collection among the public [7] - Most households possess the 1999 version at face value, with only a few special serial numbers retaining some value, and selling these notes typically requires access to currency trading markets in major cities [9]