Generally it used to referred to Bowies that were collected in Mexico, Southern California, Arizona, and SW Texas - Originally there were like two SW Bowie classes, those that were based on Espada Acha short swords -
https://therionarms.com/articles/index.shtml (see article toward the bottom). The second class were the wide, nose heavy, clip point knives and machetes that were favored 1850's - ,
The Aragon models that were popular there for decades -
https://cdn.hibid.com/img.axd?id=43...MAX&checksum=en72hKmPMlAKeJM7FMeSi71yKELlnBTg .
https://bid.antonycribb.com/images/lot/6106/61068_0.jpg .
Earlier Collins and Co models -
https://www.collectorsfirearms.com/971023/pre-ww1-collins-no-17-bowie-knife-no-10-sheath-mew2627.jpg .
The big Abels Bowie was considered a classic in the style -
https://ia601602.us.archive.org/Boo...org&page=leaf1&fail=preview&&scale=4&rotate=0 .
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After a while, the Espada Ancha took a back seat, and ignored were the standard Sheffield styles that were there too, and it seemed most collectors and custom makers concentrated on the wide and broad clip points..
The main points for the style were -
Big Clip point
Big, but not massive guard. Usually S curved, S curved with index finger ring, or flat.
Natural handle material - Stag, horn, then woods, ivories, etc....