You can see Mister Rogers demonstrate the use of what appears to be a Royal Futura 800 in the full episode here: https://misterrogers.org/episodes/typewriters/
“I was very much interested in letters.”
—Fred Rogers
While he used a Futura in the show, his personal typewriters included a 1930’s Royal portable (possibly a Model O?) and a Royal KMG, which can be visited at the Fred Rogers Institute by joining the 143 Club.
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And if you’re a serious fan, you’ll potentially have a Royal KMG and Futura of your own.
Nice
My first guess was Adler from the coloration. And the ribbon cover looks rounder than the Futura to me.