50 Pfennig

Neubrandenburg's 1921 Pfennig notgeld series falls squarely in the middle of the great German municipal currency boom — by that year, thousands of towns were commissioning decorative small-denomination emergency notes, partly from genuine small-change shortages and partly as deliberate collectibles sold to satisfy a voracious philatelic market. Louis Koch of Halberstadt was a mid-tier provincial printer who handled commissions from numerous northern German municipalities during this period.

The DeNG reference suffix ".2a-5/9" indicates this is one of several design variants within the series — Koch's Halberstadt operation typically ran such series with minor color or vignette differences across the same denomination to encourage complete-set collecting.