That is a standard Omega sump plug. Very early ones were Hex bolts torqued to 55Nm, this torx type is 10Nm, and doesn't need a copper sealing washer.
As point out, that axle stand is lethal as the car could easily slip off it 
Additionally, do not use the subframe crossmember to support the car - its not designed for it, and will likely damage the subframe
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But why? I have jacked the car up from the front cross member always when changing the tyres (and we do it twice a year here) and it is the only place where to lift to get the whole front up at the same time. What will be/what have I damaged?
subframe is not designed to take the forces in that direction, hence can easily be distorted. If you need to lift the whole of the front at once, you should still lift on jacking points (and obviously, if not using proper lift, support on chassis rails.