The complete set in detail

ZB37
Sc. No. B298
7th centenary of Cologne Cathedral : Madonna, watermark 'multiple letters' - 6 Pfg. + 4 Pfg. ; yellow-brown

ZB38
Sc. No. B299
7th centenary of Cologne Cathedral : The tree Wise Man, watermark 'multiple letters' - 12 Pfg. + 8 Pfg.

ZB39
Sc. No. B300
7th centenary of Cologne Cathedral : Cathedral, watermark 'multiple letters' - 24 Pfg. + 16 Pfg. ; carmine-pink

ZB40
Sc. No. B301
7th centenary of Cologne Cathedral : Cathedral big size, watermark 'multiple letters' - 50 Pfg. + 50 Pfg. ; blue