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