The Onoto Magna was a flag ship pen of its day. It had a 14crt size 7 two tone nib, and was available in black and various candystripe colours. It was produced from the mid 30s to 1958 when pen production ceased.
De La Rue Archive

Ref. 508
De La Rue, large Onoto 1822, piston filler, BHR, gold filled, medium Onoto 14crt size 6 nib, two cap bands, rare, no scratches or marks, circa 1930s, English, (very good). Sold