country obtained from

• (no filter) 

  Australia (1) Belgium (2) Canada (1) France (1) Germany (1) Netherlands (4) United Kingdom (4) United States (3) Venezuela (1)

graduation

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  deg (5) gon / grad (2) m (1) mil (6400) (1) yard (4)

fine reading

•  direct (analog) (8)
•  drum micrometer (1)
•  scale micrometer (3)

Type of use

•  Military (4)
•  Navigation (3)
•  Survey (10)

Material

•  Aluminium (2)
•  Brass (16)
•  Plastic (1)
•  Steel (6)
•  Wood (1)

image direction

• (no filter) 

  inverted (6) upright (6)

Brand

•  Ajax Engineering Co. (1)
•  E.R. Watts and Son (1)
•  JH Steward (1)
•  Keuffel and Esser (2)
•  Schick (2)
•  T. Cooke and sons (1)
•  Wild Heerbrugg (12)