https://old.reddit.com/r/typewriters/comments/1h4b3aw/is_there_a_source_that_exists_that_sells_or/

If you need them for basic functionality, often you can find the manuals of the original manufacturers' models for rebrands (example: the Sears Tower machines which were really just rebrandings of the Smith-Corona 5 series).

Additionally, after the 1930s there really wasn't a lot of new functionality, so almost any manual will help you to get you where you need to go, though there are some small differences in locations of things like carriage locks which can be helpful to know about and whose placement moved around on various machines.

You might also notice that as typewriters were more ubiquitous in the 60s and 70s their manuals got thinner and thinner with less detail. If you do find a specific manual, you're unlikely to find very much in it.

The Davis Brothers have some history on the Commodore line which was related to some of the Sears Chevron line. Polt does have two Commodore manuals which may be close to your machine: https://site.xavier.edu/polt/typewriters/tw-manuals.html

On some of the Sears rebranded Smith-Coronas in the 6 series (Citation, in particular) there are 1 1/2 line spacing options.

https://www.reddit.com/r/typewriters/comments/17utzze/identity_of_the_red_typewriter_from_taylor_swifts/

Taylor Swift uses a Sears Cutlass in All Too Well: The Short Film.

The Sears Cutlass is very similar to the Sears Citation.

https://typewriterdatabase.com/sears.615.typewriter-serial-number-database

https://christmas.musetechnical.com/

Catalogs & Wishbooks from Sears, Montgomery Ward, and JC Penny

https://www.ebay.com/itm/375385572993

Sold, presumably for $600 on 2024-04-20 with free shipping. This had previously been listed and relisted for 1000 reducing 100 every few weeks until now.

Taylor Swift effect with her new album drop perhaps?

https://shopgoodwill.com/item/192251351<br /> 2024-03-02 sold<br /> $18.00<br /> 5 bids

https://oztypewriter.blogspot.com/2022/06/searing-cutlass-typewriter-in-taylor.html

https://backdoorbroadcasting.net/2019/10/elizabeth-sears-academic-refugees-in-the-1930s-in-and-around-the-warburg-circle/

Reading room at the Warburg Institute, via Elizabeth Sears.

Is this part of Aby Warburg's zettelkasten?

Interesting to see the interaction between Sears Holdings and Seritage. The value is apparently all in the real estate.