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How is this made: Aluminium mould

How is this made: Aluminium mould

(OP)
Hi guys,

I have attached a picture of what I believe is an aluminium mould from the expanded polystyrene industry.

On the side walls of the mould, it has what looks like 0.5-0.8 mm vertical slits through the aluminium (likely 5-10mm thick). Basically I am trying to determine how this was manufactured. The standard industry solution is shown around the radius of the mould where they have drilled holes and then press fit 10mm vents.

My best guess is something along the lines of:
1. The mould is made in 9 bits (4 side walls, 1 base and 4 corners (the rounded part in the pic). I think there is a visible line separating the side wall from the corner in the photo. Also, it looks like a standard machining pattern at the top of that vertical wall indicating it was milled horizontally on a vertical mill.
2. The slots are cut with a laser or a slitting saw? I have asked a couple of local laser cutting guys about it and none seem to think they can achieve it.

What are your thoughts?

Cheers,
Hamish

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