Short answer: yes

Longer answer: and questions
- Are you a modern gun type, or do you appreciate vintage guns for what they are and were?
- just for fun, or will you hunt them, and what game?
- Do you reload?
- The .375 Flanged; is it the older 2 1/2" Nitro Express or is it the .375 Mag Flanged NE? Either one is a reloading only prospect. Prepare for hassles getting brass and dies. "May" shoot only 1 load accurately
- .450 3 1/4" …..made for the .450 3 1/4" 480 grain bullet Nitro load? Same brass and dies problem as above and factory ammo is scarce and expensive. Same deal with regulation, and they are like shooting a .458 Win Mag and useful for the same game.
- 9.3x74R a do everything cartridge (except maybe Elephant)

- Sabatti are the lowest end price point, however I have one in 9.3x74R and it has been quite accurate, serviceable, and is certainly holding up. Don't risk a "made for Cabelas" Sabatti, even if new old stock/never fired.
- Have never heard of a Gaucher (I'm principally a vintage/antique Brit rifle kind of guy)

As to the Wilkinson and Sauer; condition is everything. You have to either: implicitly trust the seller, be knowledgeable enough to "vet" the rifle yourself, or have a very good double rifle gunsmith lined up and the extra $$$ to bring a marginal choice up to speed. Even the best big named double rifle sellers will sometimes not disclose known issues with vintage rifles.

"Worth owning"? Only you can ultimately answer that, it can be a very individual thing.
- Mike