64496: The Field-Postcard

475 Graves (Robert) AUTOGRAPH POSTCARD signed (written in pencil), 1.R.W.Fus. B.E.F. Nov 27, '15 to Edward Marsh, autograph address panel on verso signed, Post Office and Censor's postmarks £30
'In the last few days I've been made a captain and shifted here. I won't get any leave till January at the earliest...'
Back in '15, when life was harsh
And blood was hourly shed,
I reassured Sir Edward Marsh
So far I was not dead.
My field-postcard duly arrived,
It seems, at Gray's Inn Square
Where Eddie, glad I still survived,
Ruffled his thinning hair ...
A full half century out of sight
It lay securely hid
Till Francis Edwards with delight
Sold it for thirty quid.
But who retained the copyright,
The invaluable copyright?
In common law I did.