This is an Australian Registered first day cover of 1951 which was undelivered as the addressee had left the address in New Zealand.
There are 5 date stamps on the reverse and 3 manuscript marks, which makes for interesting research.
The address of only a name and a town in New Zealand seems inadequate.
The amazing thing is that with 9 postal attachments or stamps, on the front of the letter the set of 4 postage stamps were perfectly postmarked with the date stamp and nothing else!
With the propensity for using biro or crayon marks these days, could you imagine a current cover staying in that condition? I think not.
Regards
Ron

