DX-SFX

That strikes me as so close as makes no odds.

Looks like the examples in the link I posted above.

Now this is interesting. E-Paints have a reputation for knowing their stuff. https://www.e-paint.co.uk/colour-alternatives.asp?cRange=Federal+Standard+595C&cRef=17875&cDescription=Insignia+white+/+ANA+515+/+MIL-E-1115+

The rudder looks whiter than the colour underneath too even allowing for weathering.

Late to the party on this one but did want to throw in a few observations. I did some research on various whites for another project, all based on car colours, all of which you'd swear were white when seen on the vehicle in isolation outside. In fact none of the manufacturers produce a car painted in a pure white (it would be rather dazzling) so memory of observation can be misleading. In fact most were surprisingly grey/tinged when offered up to a real white. Even rattle can white primers vary a lot from manufacturer to manufacturer even though each appears to be white. I can only suggest anyone reading this goes find two different white primers from their collection and compares some sprayed samples.

Here's the link to the Japanese site selling off the old stocks of genuine Olympos airbrushes again with the obvious relation between these and the current designs available from other suppliers. Having several Olympos airbrushes (as well as Iwata, Rich, and Sparmax), I can confirm they are top of the quality pyramid. http://olympos-airbrush.ocnk.net

I'm late to this one by about a year but I can confirm what Robbyrockett has been saying. The parts do come from the same production line and are interchangeable in nearly all cases. Olympos (spelt correctly) are the originators of most of the Iwata designs and old stocks of brand new Olympos airbrushes can still be bought from Japan. Iwata bought the rights and now have them produced under their own name by Rich. Rich also produce the same airbrushes at a fraction of the cost and also manufacture for Tamiya. Great Art carry most of the Rich airbrush range but this link is provided to illustrate the obvious family relation between a Rich AB-300 and an Iwata HP-C. https://www.greatart.co.uk/rich-ab300-airbrush-gun.html Also, don't mistake the cheap Chinese knock offs with the good stuff.

As a footnote, we all know that the paint colours during the war did vary. I find it's not so much about how close individual colours are but how they compare in conjunction with each other. A colour that's slightly too dark next to a colour that's slightly too light looks too contrasty where a set of colours all slightly too dark or all slightly too light, both look correct.

By a coincidence, I've been putting paint strips together this week comparing all the manufacturers shades and comparing them against the colour chips in the British Aviation Colours Of WWII book. I make no comment about the spray/brush quality of the paints but based on the ones I've sampled so far, the Vallejo "Battle Of Britain" box set overall are consistently good. Humbrol 30 Dark Green is way too bright and vivid. XtraColor enamel Dark Green is too brown. Humbrol 163 green is also a tad too brown. Tamiya's new XF-81 dark green is a good shade if a little "faded" in appearance and Vallejo 71.324 is a good "newly painted" shade. Tamiya and Vallejo also win in the Dark Earth group and the same two triumph in the Ocean Grey (XF-82 and 71.273) category. Clear winner for Medium Sea Grey is Tamiya XF-83 There's another thread covering Sky so I won't go there.