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What is the purpose of the gap on the live pin of this plug?

I've never seen this before and was why this gap was their since the plug is only for an alarm clock.

The gap goes down the middle of the live pin to half way down the pin the pictures below show the plug.

enter image description here

enter image description here

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    \$\begingroup\$ Probably purely mechanical reasons, since the top forms one end of the fuse holder and needs a certain degree of 'springiness'. \$\endgroup\$ – brhans Aug 2 '16 at 0:31
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    \$\begingroup\$ That's a very old plug, and could no longer be legally sold. There should be insulation around the first 8-10mm of the pins, so that if tiny fingers get in there before the connection breaks ... you get the picture. \$\endgroup\$ – Brian Drummond Aug 2 '16 at 10:06
  • \$\begingroup\$ The clock has chips dated 1980 on it and because you had to wire plugs yourself back then the plug itself probably predates that which would explain the lack of insulation. I just found it to be very odd as I've never seen a design like that before, thanks everyone for your answers :) \$\endgroup\$ – bob1252 Aug 2 '16 at 20:49
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The live pin has a gap because the part on the other side of the plastic forms the fuse clip. The gap will have no affect on the current-carrying capacity of the pin, but the two parts on either side of the gap form the fuse clip as your photo shows very nicely. Clever design.

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