As demand for the Registered Letter RE 4 - issued 1. September 1959 - was very low it was withdrawn on 31 October 1961.
Only 2450 pieces were sold.
Looking at auctions you find them offered mostly in mint condition.
I would like to draw a list of PNG Registered Letters RE4 that were properly used.
Please add pictures of any known examples.
Or you may contact me via: WolfgangHoelzl[at]gmx.de
I will start with two RE4s from my collection:
Port Moresby R-Nr. 50976
RE4 without additional franking are hardly encountered.
Madang R-Nr. 16036
Please note:
I have recently started a similar thread on PNG 1953 1/0½d Registered Envelope RE3
https://www.stampboards.com/viewtopic.php?f=13&t=65248