If the "Hanks Effect" was really so prominent, then we should see the commensurate rise in price of 5 Series Smith Coronas and particularly the Clipper and the Silent which he's also mentioned several times. In fact, he's said these would be the typewriter he'd keep if he had to get rid of all others. Given this fact, it has to be, in part, a variety of other factors which inflates the prices.

Personally I think that it's a combination of the fact that they were manufactured at the peak of typewriter use and manufacturing and before companies began using more plastic and cheaper manufacturing methods, but were also done in a later timeperiod when exterior design and color were on the rise as a differentiator in the marketplace. Quality, form, and function become part of a trifecta which drive desire and collectability.

Tom Hanks Typewriter Collection #329<br /> Corona Junior donated to Vale Typewriter in March 2023

Tom Hanks Reviews the Children’s Novel ‘Olivetti,’ by Allie Millington by [[Tom Hanks]]

https://www.reddit.com/r/typewriters/comments/efqkpc/tom_hanks_starred_in_a_movie_where_he_uses_many/

https://www.youtube.com/watch?v=SzXvxb-g0vM

You've got to love that Kinnear's character has two of these, one as a "backup".

Tom Hanks Changes the Ribbon on a Typewriter - Secret Talent Theatre - Vanity Fair

Tom Hanks: Uncommon Type

“Tom Hanks, Typewriter Enthusiast.” CBS News Sunday Morning. CBS, October 15, 2017. https://www.youtube.com/watch?v=UTtDb73NkNM.

Friday<br /> 7 July <br /> 2017

Lee,

You are a wise and brave man. This 1930's era Smith- corona Clipper will last you for the ages..

Happy to have served you...<br /> /s<br /> Tom Hanks

Hanks wrote this letter to an interviewer who purchased one. Lost here on the viewer is the fact that the Clipper wasn't manufactured until 1946...

This is what I would suggest: if you wanted the perfect typewriter that will last forever that would be a great conversation piece, I'd say get the Smith-Corona Clipper. That will be as satisfying a typing experience as you will ever have. —Tom Hanks on CBS Sunday Morning: "Tom Hanks, Typewriter Enthusiast" at 07:30

Typewriters, More Than Just a Hobby for Tom Hanks

—Tom Hanks in TribLive 2020-05-22 at https://web.archive.org/web/20200522085215/https://archive.triblive.com/aande/books/tom-hanks-on-his-love-of-typewriters-and-the-free-press/

I've seen several sites and listings for Smith-Corona typewriters which mention this interview quote.