1939 Sc 606A Miner Scott 734 var. Line perf. variety

1939 Miner. Block of 4. Line perforation variety.

Standard Collection: 606A
Scott: 734 var.
Michel: 676 I C
Perforation: Line 12.
Condition: MNH OG block of 4.

Usual #606/734 stamp has comb. perforation.