1 in stock
These propelling pencils are also available separately. Leads in boxes are $10 each, the grey bakelite pencil at top (Onoto) is $55, the others $30 each.
The first patent for a refillable pencil with lead propelling mechanism was issued in Britain in 1822. The first spring loaded mechanical pencil was patented in 1877 and the twist feed mechanism in 1895. The 0.9mm lead was introduced in 1938, followed by 0.3, 0.5 and 0.7 sizes. Today other sizes are also available.