the mark says AR for Albert Rodrian, one half of RaRo. If you ever see an R inside an octagon thats the mark for the other half, Alfred Ransmayer.
via Koponewt (aka Otto Koponen) https://www.reddit.com/r/typewriters/comments/1kg83kz/olympia_typeface/
Ro1T is RaRo Modern Pica typeface.
The AR foundry mark stands for Albert Rodrian, one half of RaRo. (the other being Alfred Ransmayer, Ra type foundry mark is a R inside an octagon.4[2:39 AM]
via Pelicram at https://discord.com/channels/639936208734126107/639939010541649951/1289159334948765789
Ro105 is a variant of the Ro1 Standard Pica.
105 AR
via Pelicram at https://discord.com/channels/639936208734126107/639939010541649951/1289158278214844437
Smith-Corona typewriters generally have either Hulse or RaRo slugs.
Both used the number "1" as their code for their Standard Pica typefaces.
Hulse slug pattern:
RaRo slug pattern:
via Pelicram at https://discord.com/channels/639936208734126107/639939010541649951/1289001269712916595
Origin of Royal's Vogue by [[x over it]]