originally from Germany

[P.Y.]

My wild guess is Ernst Plank Spur 8 65mm, but I'm not a collector.
It can also be what Carette and Bing called Spur III 67mm, which Schoenner called Spur IIa.
At that time there was no common standards as today.
And the guage was measured at the top of the round rails, not between as done today.

You should try the German forum Historische Modellbahnen.
Post in the subforum Tinplate und andere große Spuren / größer als 1.

Thank you for your answer and help with the forum.

Greetings. I posted a post on the forum that you recommended to me, thank you. Everything is great, join us. Your conclusions and recommendations will be useful.
Regards, Yuri
http://www.maetrix.net/t12739f70-Urspru ... otive.html

[rebelego]

Cool. Looks like they misread your ruler.
Edit: Or I did.