It seems to be well built and sturdy. I do not see anything cracked or broken. It rotates nicely and all of the mechanisms appear to be functioning as they should. On the base "1984" is handwritten which might be a clue as to how old this might be?
Please see last three photos for dimensions of this engine. The item "OLD / VINTAGE LIVE STEAM ENGINE TOY MODEL KIT BRASS, WOOD ANTIQUE" is in sale since Thursday, January 19, 2017.
This item is in the category "Toys & Hobbies\Models & Kits\Tools, Supplies & Engines". The seller is "grma1" and is located in Shelton, Connecticut. This item can be shipped worldwide.