While you’re thinking this one over (queue Jeopardy music) take a look at a little site I just ran across today. Mymymymy…Poetic Typewriters. The typewriters are expensive, but gorgeous. The layout on this site is to die for.
Pulled out ole Mamie the unflappable SC Silent for this typecast. Bless her heart. She still types like a dream, but not when a girl has elegantly long vacation nails. Those round keys do a number on a manicure.
No Telling 
Touch control + nameplate on paper tray + no model name beneath the nameplate = Royal Portable Standard, aka Model O. If you're really lucky, it may be the much scarcer Model A, which is just like the Model O but has a tab key.
See, this is why the rest of us so not play typewriter trivia while Olivander is in the room. He's the Ken Jennings of typers.
Olivander: Sucking all the fun out of guess-the-typewriter, since the internet was invented.
Olivander, I can only presume you plan to publish a typewriter reference tome. It's time a good, modern one was out there, with your brand of ass kicking photography. The Will Davis site is excelllent, but hey, I want something on paper!
As soon as I get my hands on the Royal, I'm checking for the tab key.Olivander is, in fact, a typewriter god.
Good luck!! Keep us posted
Sorry. Didn't mean to spoil everyone's fun.[shuffles toe in the dirt]
You are really good person.All the best dear.
Thank you, r4!