Origin of the American phrase getting down to brass tacks

Q: When people prepare to discuss serious business, they often say they’re “getting down to brass tacks.” Why tacks? Why brass?

What is the origin of the phrase 'getting down to brass tacks'? What exactly is the phrase meant to convey? - Quora

a hypothesis as to the origin of 'to get down to brass tacks

Collectors profile: Brass Tacks - The Magazine Antiques

Get Down to Brass Tacks

US Keg Sizes and Their Measurement in Barrels – Coldbreak

What could a US recession mean for gold and gold equities?

Get Down to Brass Tacks

A thread about the phrase “let's get down to brass tacks.” : r/MurderedByWords

Get Down to Brass Tacks What Does this Helpful Idiom Mean? • 7ESL