Produced using a single hand pressed OB device.

20c Deep Ultramarine
OB-E3-BK

Split OB
OB-E3a-BK

Inverted Split OB
OB-E3b-BK

Slanted Variety
OB-E3var-BK

20c Dull Ultramarine
OB-E3-RD

Double OB
OB-E3a-RD

Double Inverted OB
OB-E3b-RD

Split OB
OB-E3c-RD

Inverted Split OB
OB-E3d-RD

Red & Black Split OB
OB-E2e-RD
Other color shades of the issue exist.
O
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