How we research and check facts

Where facts come from

Every page is built from a research file. The research uses period sources first: trade magazines such as Weeds Trees and Turf and Hardware Age, newspaper dealer advertisements, owner's manuals and parts lists, government notices such as Consumer Product Safety Commission recalls, court and bankruptcy records, and company annual reports. Collector registries and clubs are used for production numbers, and are named when we rely on them.

How facts are checked

Numbers, dates and prices are checked against at least two independent sources where two exist. If only one source exists we say whose figure it is. Prices are given in the dollars of their year, with the year and source.

How pages are written

Pages are drafted by our researchers, sometimes with the help of AI writing tools. Our editor, Wardah Noor, checks every page line by line against its research file before it is published. Nothing is published that a person has not read and checked. We publish a few pages at a time, not in bulk.

Corrections

If you find a mistake, tell us. We fix it, change the Updated date and, for anything more than a typo, add a note to the page saying what changed.

How we make money

The site may show advertising and links to stores such as eBay and Amazon. If you buy through a store link we may earn a small commission at no extra cost to you. Advertisers and stores have no say in what we write, and we link to the search for the part, not to a product we were paid to recommend.