Registered Envelope 1922 George V 5d format F "code B.Q."

Registered Envelope, 1922 George V 5d light green, size format F, code B.Q., used from Dublin in November 1922 to Saxony with additional 1d Thom 5-line 1d. Various transit markings include a green German Currency Control Inspector's seal. Fine, rare and clean. Jung / FAI EU 1aF.
This is from the time when Germany's rampant inflation was gaining momentum.