A post WW2 Union Movement lapel/tie pin in chromed base metal.
Pin is with correct spiralling, no maker marks as is common.
The Union Movement was effectively the post WW2 resurrected British Union of Fascists, still lead by pre WW2 leader Oswald Mosley.
A shadow of its pre-war counter part, the UM challenged for office mainly in local elections with limited success.
Post war examples of this badge come in 3 – 4 varying sizes, this being the smallest version.