The beautiful laminated transparent mesh pattern material applied to Onoto pen caps and barrels was developed by Onoto in the 1930s.
The De La Rue Company Ltd

Ref. 997
The Onoto Ink Pencil, stylographic, black with gold filled trim, lever filler, boxed with instructions, crisp barrel imprints, no brassing, cap and barrel glossy and unmarked, English - London, c.1930s, (excellent). Sold

Ref. 243
Onoto The Pencil, rolled gold trim, dark blue barrel, crisp imprints, in original box with instructions, circa 1950s, (as new). Sold