Hugo Pratt 1976 Covention drawing for British magazine

This is a genuine Pratt sketch since I bought it from Vault auctions in 2005 in a Lucca 1976 sketches lot (see here the complete lot http://digilander.libero.it/apicespa/comic%20art.JPG )

taken from the Denis Gifford collection (see his profile here http://en.wikipedia.org/wiki/Denis_Gifford)

Gifford attended Lucca 12 edition as editor of Ally Sloper magazine and asked to all artists to give an interpretation of the old comic character, I have a copy of this where a couple of my sketches were published together with some considerations on the comic festival (here: http://digilander.libero.it/apicespa/allysloper3.JPG )

also with a funny comic page stating Gifford and Pratt met there (see here http://digilander.libero.it/apicespa/allysloper2.JPG )

I doubt any Pratt sketches out there may have as many evidences as mine