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

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And this one with matching post card

https://www.officeofsteamforum.com/ebay/old-add-for-free-steam-engine-looks-like-a-weedenbuckman-kind-of/?message=52209

I remembered seeing the post-card engine somewhere.  I don't know who made it, though I have my suspicions.  The "Hero" "Ajax" and "Empire" engines are featured in the 1880 Ives, Blakeslee & Co. catalog.  There are accessories on page 106, and The steam engines are on pages 105-107.  The Ajax is on page 106.  Price is $10/doz.

Thanks Charlie for jogging my memory.  BTW, the price for the Hero has doubled from the ad you sent.