Viewer convex lens in cylinder plate with rectangular window

1851-1900

Linen prover, English, mid 19th century

1850-1960

Brass linen prover, English, late 18th century

1770-1800

Tiny linen prover

1801-1900

Linen prover, probably French, in case, 1850-1900

1851-1900

Linen prover

1801-1850