The SPECIMEN overprint positioned just below centre of the stamp is 13.5mm long. Two printings were apparently made – the first overprint positioned just below centre and with the second overprint in the extreme lower right corner. A total of 29 sheets of 120 ( = 3,480 stamps) were supplied by the Note Printing Branch. Only one sheet of 120 stamps was printed with the SPECIMEN overprint positioned below centre.
The Navigator specimens were not issued singularly, all were originally part of the Collector's Pack, Specimen Navigators sold singularly was the result of collectors and stamp dealers (the latter being the worst culprit) pulling the pack apart to sell the high value specimen. Many of both overprints were hinged and not all the packs were sold and later destroyed by the Post Office. It is estimated that from 120 Collector packs housing the rare stamp, only 20 of these packs exist intact today, and only 50 of the singular £2 with central overprint exist.
The market interest of this rare stamp had skyrocketed in recent years, it's rarity on the philatelic stage finally realized.
2015 - $475
2019 - $750
2021 - $1,250


2015

2019

2021