This is a new old stock uncut Union key blank, FP blade profile. Made in England, this original blank is nickel over brass. I have a number of these, they are old stock and may have slight discoloration.
These were used from the mid 50s to the early 60s on loads of different British car makes and models as ignition, door, boot keys.
I can cut these to a provided FP code, or sell outright as blanks, same price.
There are no returns on cut keys, be sure of what you need, ask questions if you're unsure.