Columbus model letter balance, German
1900-1914
Postal scales, Bismar type
Postal Scale
1890-1910
Parcel platform balance by De Grave London, 1850-1880
1850-1880
Double pendulum postal balance
Brass letter balance, Roberval type, 1871-1897
1871-1897
Pendulum-type letter balance, German
1900-1914
Equal-arm Roberval-type letter balance
1900-1914
Equal-arm Roberval-type letter balance
1900-1914
Bilateral pendulum-type letter balance, German
1900-1914
Quadrant pendulum-type letter balance, German
1900-1914
Spring postal balance with dial scale
1960
Balance scales, Roberval's system
Letter and parcel balance, Willis patent
Braby quadrant type
1826
Hoopers pocket letter weight
1840-1850
German letter balance
1900-1914
Postal scales, self-indicating type, 1900
1900-1910
Hydraulic letter balance
1840-1850
Letter scale, spring balance
19th century Indian Postal Balance
Brass self-indicating Letter Balance
1863-1875
"Osler's Patent Letter Gauge" (c.1839)
1840-1850
GPO parcel scale by De Grave
1850-1880
Hall's postal balance made by Parnell, London, 1863-1875
1863-1875
Cardboard 'Easy Weigh' postal balance by Royal Mail to check 20
2000
"Oslers Patent Letter Gauge" (c.1839)
1840-1850
"Osler's Patent Letter Gauge" (c.1839)
1840-1850