Wanted: Not Lambert, still cool Durham Elliptical Chainring

I am going to claim "newbie" here as this is not Lambert or Viscount and there doesn't seem to be an absolute rule against it. I am looking for a Durham Elliptical chainring AND other makes of oval chainrings for our quickly populating bicycle museum. Prefer to also have it installed on a period-correct crank. Here's a link from velobase velobase.com/CompImages/CrankRing/B7C758B9-C6D9-4D86-B3BD-9E82CB4ED9CC.jpeg

Thanks for looking in your spares bin!