Yes Seamus, that's the 1954 first model and with the original hose, too. You lucky duck.
Is it a Perrivale Constellation? And does it have the floater mofification to the base?
Our Cana/US model 82 non-floater was manufactured, along with the floating mulberry 84 and Heather Rose 85, from Nov.17.54 to 1957. The 1958 model 86 was golden colour and the first with the fixed hose partway down the side and the new handle with the tailfin.
Yours looks to be in superb cosmetic condiion. Congrats!