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a bit big for bomb fuse timer... drum magazine spring? dynamo spring in field telephone? otherwise, things like that are always seen on recoil starters of small engines.
It appears to be a recoil return spring assembly in 303 british. Apparently they had a habit of breaking a lot and were in short supply during the war.
They are the clockwork operating spring for a Lewis LMG. If you are interested in selling one or more please e-mail John@wolverinesupplies.com as these old springs have a nasty habit of breaking.
Thanks John