Here is the list of pop chart peaks for THE LAST WALTZ from available global chart data:
#1 - UK, South Africa, New Zealand
#3 - Norway
#6 - Holland
#7 - Finland
#11 - Denmark
#14 - Germany
#21 - USA (Record World; Billboard)
#25 - USA (Billboard)
Foreign language cover versions of the song charted as follows:
#1 - France - LA DERNIERE VALSE - Mireille Mathieu
#2 - Italy - L'ULTIMO VALZER - Dalida
#9 - Sweden - DEN SISTA VALSEN - Svante Thuresson.
I've found a South African copy - so will add it to 45Cat and link to this issue - I've already scanned it, as I suspected it was a rare issue - so will add those too.
This confirms kimbozw's note about it sharing the same fold around sleeve/cat. no.
My copy has a 4-prong push-out centre and black/silver Decca labels