Same gun? The SN and barrel flats are not shown
https://www.gunsamerica.com/9139617...-GRAND-PRIZE-1906-PRESENTATION-PRIZE.htm

Another sold in UK with 2 1/2" chambers
https://zh-cn.facebook.com/countrywaygunshop/posts/2353861118199057

As Jt said a prize winner at the Exposition Internationale de Milan, 1906
https://archive.org/details/expositionintern00drey