That slant head is rather nice. Fairly mild, Tech level for me. I don't think they're machined, but quite reasonably well made.
They also list these in their eBay store:
Buy Collectable Barber Safety Razors and get the best deals at the lowest prices on eBay! Great Savings & Free Delivery / Collection on many items
www.ebay.co.uk
I don't know whether they're machined or cast and then coated either, but the coating isn't very durable.
I had the open comb variant and I think it's the only razor I ever returned (other than one with a misadvertised Amazon listing). It was very aggressive, perhaps even more than the PAA Evolution DOC, and I find the Evolution more aggressive than the R41 and dscosmetics Z0. I'd rather use a shavette instead.
Perhaps the slant and the safety bar heads are more forgiving shavers, though.