Actually, it appears this is from 1913-14.
I was going through the patents from Ora Drake, the inventor of this wacky vacuum head, and noticed the early ones, like the one stamped on the plate of mine, were a bit different. This original model was originally sold as the Diamond in both the USA and Britain. It featured a pivoting ball for the handle, and a taller fan case. Shown below. This patent: https://patents.google.com/patent/US1000382A/en?inventor=ora+drake&oq=ora+drake&sort=old
The next patent with illustration, from 1913, shows the base which is on my Brilliant. 4 wheels, no suction slats, and a twisted wire brush. Also, no handle ball joint. Shown here:
https://patents.google.com/patent/US1126732A/en?inventor=ora+drake&oq=ora+drake&sort=old
More improvements were made to the design, as shown here: https://patents.google.com/patent/USD46631S/en?inventor=ora+drake&oq=ora+drake&sort=old
And here, this time with a whole new base: https://patents.google.com/patent/US1291802A/en?inventor=ora+drake&oq=ora+drake&sort=old
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