The manuscript paper this completion is written on dates from Britten's period in the USA. It has not yet been possible to narrow the date down more specifically.
From Faust, Part I (set in German)
This completion was made while Britten was in the United States, possibly because he left the earlier completion behind in England (see 'related works'). It is very similar to the earlier version (which has been published) but there are some minor differences.