Why? IMO clunky for no reason they look heavy and have so many places to clean all the time. So a bit more info maybe. They look very old to me like vintage.

If you do a search for “knobs with backplates” you will get a lot of photos. Even if you don’t find the exact same item, you will find a substitute that fits your profile.

They’re quite unique so also search through Etsy.com and other antique hardware sites. I think they’re interesting and worth repeating.

Thank you. They aren't vintage. They are polished nickel. Humphrey Munson uses them in the UK on their cabinets, but this was on a new kitchen in the USA. I've searched every knob maker I can think of and the only polished nickel backplate I can find is Top Knobs Channing. Maybe someone else will comment and know who makes them. They are chunky, but only need a few and don't mind cleaning.

They look to be knobs with a rectangular backplate. You might look at knobs4less.com or myknobs.com. Probably can buy them in two pieces--the knob and the backplate.

Here's a backplate: https://www.myknobs.com/pdp/atl378brn/atl378ch-1/atlas-homewares-3-11-16-l-bracket-backplate-in-polished-chrome

and here's a knob: https://www.myknobs.com/pdp/colonial-bronze-diamond-knurl-round-knob/colonial-bronze-595-26/colonial-bronze-1-1-4-cabinet-knob-hand-finished-in-polished-chrome

Thank you for the research. The knobs in my photo are polished nickel and the only backplate I can find is Top Knobs Channing. I can't find a polished nickel knob to fit the Channing backplate.

Where did you find that picture you posted? I’ve had good luck DMing social media accounts or contacting the designer directly for sources/brand names if they aren’t tagged in posts. I saw HM replied to one comment on IG that those knobs were bespoke, but the designer or owner of that US kitchen may be helpful.

Atlanta Holiday Home and yes, I keep hearing "bespoke." Bespoke by whom? lol Someone has to be manufacturing them for cabinet makers.

Richelieu Hardware has some that look similar. This one comes in brushed nickel and chrome finishes. Knob and backplate

Also this one too.

There are other separate options at Richelieu that you could pair to make something similar.

Here is the designer‘s info. She responds to a lot of questions on IG about her projects. Kingdom Woodworks did the cabinets.

https://www.ironmongerydirect.co.uk/product/frelan-hoxton-sturt-cabinet-knob-on-rushton-backplate-30mm-diameter-polished-nickel-974332

https://rh.com/catalog/category/products.jsp?categoryId=cat1512021&pgterm=RH+All+Knobs&topCatId=cat1630014&parentCatId=cat3850005

Have you looked at the unique hardware from Crate & Barrel or CB2?

Beverly to the Rescue! Thank you so much!!! I have not looked at CB2 or Crate. I'll do that now.

Found this online at knobs4less.com and if the dimensions work you could combine this backplate with a knob in polished nickel.

All of the knobs below can be combined with the backplate shown.

Thank you. I think I could put a round knob with the Channing backplate if the shipping from the UK ends up being exorbitant. You are a very talented investigator!

@BeverlyFLADeziner is amazing and has a ton of great advice.

I would have never found IronMongery if it weren't for Beverly!