The complete set in detail

R435
SG No. 472
1931 - The Zwinger at Dresden, welfare fund : Watermark 'mesh' - green ; 8 Pfg. + 4 Pfg.

R436
SG No. 473
1931 - Town Hall at Breslau, welfare fund : Watermark 'mesh' - carmine ; 15 Pfg. + 5 Pfg.

R437
SG No. 474
1931 - Heidelberg castle, welfare fund : Watermark 'mesh' - blue ; 25 Pfg. + 10 Pfg.

R438
SG No. 475
1931 - The Holstentor at Lübeck, welfare fund : Watermark 'mesh' - brown ; 50 Pfg. + 40 Pfg.