https://www.reddit.com/r/typewriters/comments/1t7ggls/techno_pica_typeface_hermes_3000/
Techno pica typeface on a Hermes 3000 with foundry marks "S" and "TP".

https://www.reddit.com/r/typewriters/comments/1t7ggls/techno_pica_typeface_hermes_3000/
Techno pica typeface on a Hermes 3000 with foundry marks "S" and "TP".

Foundry marks: 85U or 85DC
https://typecast.munk.org/2023/02/18/1967-womda-typewriter-typefaces-smith-corona-scm-fonts/
An example of the Elite Gothic No. 16 can be found on Reddit which has a "cross" foundry mark with 1, 6, S, empty in the four quadrants from top to bottom and left to right.
https://www.facebook.com/groups/TypewriterCollectors/posts/10163497490649678/
Royal Pica Italic typeface example with P1 as a foundry mark on the slugs.
https://www.facebook.com/groups/TypewriterCollectors/posts/10161611646934678/
1950 Underwood Rhythm Touch with Victoria Elite typeface, 12 CPI, Slugs marked "EV".
Hermes typefaces by foundry mark:<br /> S TP = Techno Pica;<br /> S TE = Techno Elite;<br /> S PP = Petit Pica;<br /> S DE = Director Elite;<br /> S NO = Epoca;<br /> S 6 = Pica;<br /> S 7 = Elite

via https://old.reddit.com/r/typewriters/comments/1q8dabt/what_typeface_is_this_on_my_hermes_3000/
Most of the slugs have a number 5 stamped on them
https://typewriterdatabase.com/1926-mercedes-4.19461.typewriter<br /> "Steile Sierschrift" (Steep ornamental font) <br /> RaRo foundry mark 5 circle I<br /> paired with<br /> RaRo foundry mark 57 AR

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/
7.6 is the motion (distance between the baseline of lower- and uppercase characters) in millimeters.
The trident is the foundry mark of Gordon Webb & Co., a British type foundry. No catalogs for this company exist on the internet so can't tell you the name they used for it. https://i.imgur.com/RQpxK05.jpeg
via u/Koponewt


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