2¢ Washington Head
Denomination in Letters

Perf 11 - perforated 11 on at least 2 adjacent sides

Perf 12 - perforated 12 on at least 2 adjacent sides

Perf 12 & Perf 8½ Coil - perforated 12 or 8½ on sides or top/bottom

Imperforate
No perforations

Private Perforations - Vending and Affixing
Machine Perforations