Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

I don't have insider info...but I have some thoughts on the etching.
   I believe the last photo where the etching is silver color and harder to see IS what Wilesco builds, they likely had it professional photographed for sales brochure... The "etching" did not show well in photo so they filled in black with paint or other product as the etching is really the main feature...it is false advertising to be sure.
   I believe you could replicate by painting the etch yourself, try not to go outside the lines to much, but after paint is dry clean up with paint thinner...if you wash to much away you can totally clean and keep experiment till you get a nice effect.
   The paint will not likely hold up to steam temps long term...there may be products that would..these are my best guess..but only speculation!