Glad to see Henry is keeping that alive. I learned to shoot on a Winchester 1906 that my father bought as a boy in 1933.
I have since passed it along to my son and then in a moment of nostalgia bought parts and built one.
My Father always told me his Pump Action Remington was bought by His Father in the Post-War '40s and kept it a secret until it was legal.
He never said how my Grandfather obtained it, whether he acquired it when they were hiding in Switzerland during the war, if he bought it off an American G.I. or if somehow managed to order it from a catalog.
I will ask my Father again next time I speak to him, but that all happened before he was born, so I don't think he really even knows. (though it is old enough not to have a government tracking number on it)