Thank You very much for help! So, left page is almost solve (there is still a handwritten word on that looks like "Ar???ory" written on the stamp). On the right page, you perfectly transcribed the stamp, and identify a word in handwritten text, but still that text isn't fully transcribed, maybe someone can fix it:
"[Navio?] Mouzinho
[?]
10/6/41 [?]"
And that Arrival text down below is fully transcribed, but still there is still signature that I think is "Mark [Johnson?]" but I am not really sure.