Jonny,
I don't know which gun the sight is off, but I am 99.999% certain it is NOT a Bofors L60 sight. The British Forward Area Sights are different in design, and attach to the sight arm using two clamping wingnuts. For this reason they had a plate welded on beneath the circular rim, with two slots at the bottom edge which fitted over the wing nut studs.
The sight in your picture has a stem thet is inserted in a hole and presumably locked by a pin in the groove at the lower end, after having been located correctly by the cross-pin furthur up.
Hope this helps.
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George Cross Island
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