“Survey of Egypt”

Data:

• 10” Rectilinear slide rule
• Paper scales A/B, C/D. No scales on rear of slide
• Incredible wooden box
• “PD1” logo front and back
• On the back paper, “Survey of Egypt”
  Survey of Egypt (c. 1898 - present; مصلحة المساحة المصرية) was the official surveying body of the Egyptian government from the turn of the 20th century until the founding of the Republic of Egypt. As Egypt was a British Protectorate for most of this period, the survey closely resembled government survey operations in other British colonies and protectorates.

Questions:

1. Can anyone throw any light on this, either logo or whatever?