Just a thought...
...could it be an Anniversary special? Correct me if I'm wrong, but the 800 came out in 1933, didn't it? Hoover's 25th anniversary! I've seen 60th anniversary and 90th anniversary Hoover cleaners with unique colour schemes (although both on Ebay Germany, oddly enough), and in 1935 Hoover also built a Jubilee model Junior 370, which all indicates that the company liked to indulge in special models.
The badge suggests to me that it was built this way; I can't imagine a reconditioner taking such care over it (it looks like a well-done job), and if it were a Hoover rebuild, it'd surely have a 'Hoover Special' type badge fitted as a replacement.
Just my two pence worth! Are you going to keep it as is, Tom? That colour does give the cleaner a certain something!