Examples of the type
Private collection
1921 – (en) Blocks АБ - 023, 026, 053, 056.Signatures: NNK, MMK(en) Blocks АБ - 023, 026, 053, 056.
1921 – (en) Blocks АБ - 023, 026, 053, 056.Signatures: NNK, MMK(en) Blocks АБ - 023, 026, 053, 056.
Block АБ - 053.