Help identify jet engine blades?

Does anybody recognize these air-cooled blades? I’m guessing they are fixed guide blades. They are about 4″ long. While they are NOS, there are no details on the wrapping (the bright green plastic stuff). They came with a load of NOS Vampire parts from the UK via USA, All other odds and ends are also UK origin – small number of Avon, Gnome, Sapphire, Nimbus, Spey, Gazelle parts. I found a faint p/n on one blade. This is what it appears to be: _55_350.

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