Rare set of 1965 5d Booklet stamps

This set is rare, there is only about 8 booklets of the Edition G6 printed with non-helecon ink in existence and a relatively small printing of the Edition N8 showing no shading dashes on left side (caused by damage to the alto plate). There is only two currently known Edition G6 on cover, the envelope shown is postmarked February 10, 1966, 4 days prior to the introduction of decimal stamps.