Scientists 

• 1952 
• Colombia 
• Wetenschappers 
• Blue 

LastDodo number

Area

Title

Face value

Country / area

Year

Month

Day

Issue group

Order Number in Issue

Basic colour

Exact colour

Usage

Type

Theme / topic

Geographical theme

Persons theme

Item subject

Michel number

Yvert number

Scott number

Stanley Gibbons number

Designer/Engraver

Printing office

Perforation

Watermark

Luminescence

Printing technique

Paper

Gum

Print run

Dimensions / diameter

Details