Drawings in this series were among a collection held on Cockatoo Island where Wing Commander (later Sir Lawrence) Wackett transferred after the RAAF Experimental Station at Randwick was closed in 1928.

They are original drawings created for the conversion of WIDGEON aircraft to SEAGULL, and are numbered in the range 55 - 164, 2390 - 14759, and A9-459, with many gaps and an unnumbered item.