I've generally found that Olympia machines with a dedicated 1 key and a 4/$ key will usually have a script font. Additionally they don't have ribbon selectors (which are most often on the right hand side of the keyboard when they are present) or only have black and stencil settings.
The lack of bichrome settings on these machines is due to the taller/lower extenders on many script glyphs.
In later units, the absence of a ribbon selector is a good clue, though later units (late ‘60s onwards) offered script with units that had ribbon selectors.
In earlier units, typewriters that have the letter 1 key is a good clue that it is a script font typewriter.
https://typewriterdatabase.com/1964-sears-citation.2600.typewriter
Sears Citations seem to have an above regular frequency for script typefaces. They shipped with red stickers next to the bichrome setting and on the right ribbon cup warning against the use of bichrome ribbon for the tallest script letters on machines which had script typefaces.
You should not have much trouble finding a cubist (aka techno, square, robotic, futuristic, etc.) font or even Vogue; but good luck finding an italic. Of course, if you want to use them instead of collecting typewriters, get an IBM Selectric and a collection of balls.
colloquial advice
Swiss-made Hermes (3000, Media 3) seems to top the list of the most sought after vintage manuals with script fontAnother popular choice among collectors is the script typewriter debuted by Olivetti Lettera in 1963.Other typewriter manufacturers that offered the script font were Olympia (SM3, SM7, SM8), Adler (Tippa, J4, J5), Royal (Safari, Sahara), Remington (Deluxe 5, Personal Riter), Smith-Corona (Classic 12, Sterling 5A, Galaxie Deluxe 10, Galaxie 11, Galaxie 12, Silent Super), Torpedo 18, Blickensderfer (with cylinder) and IBM (Selectric with typeball)
unreferenced here, so treat as colloquial
A field guide to hunting down script typewriters. by [[May Tobias-Papa]]