Siderographer’s Initials J.P.P.
 John P. Perry Scott # 437 APEX 141644 |
 John P. Perry Scott # 383 [Initials in Bottom Margin next to Centerline Arrow] |
 John P. Perry Scott # 341 Plate #4956 PSE 80644 [Initials in Bottom Margin under Stamp 100 of Right Pane] |