An unusual pattern.
Both of these vintage examples from eBay seller
GB-best
I've had a lot of questions about the pattern over the years.
And few answers.
Here's the four-block repeat
And here's the block.
It's NOT in BlockBase. I guess it should be in the category
of Miscellaneous with curves, but it's not.
It must have been a published pattern. All the photos of vintage examples
seem to be from the 1940s, '50s, maybe 1960s.
Some better pieced than others, but looking pretty much the same.
Until lately:
Cathy Kirk's Chain Reaction from Denyse Schmidt prints
Cathy Kirk sells pattern and templates for Chain Reaction:
And I do believe Nancy Landon might sell a pattern
for Unchained Melody at her Cactus Quilt Shop.
The templates come in three sizes.
Ivan and Lucy made a version in 1930s reproductions:
Which they call Chain Link.
Here's their Etsy shop:
But it must have been a published pattern with a name seventy years ago or so.
UPDATE:
Someone called my attention to a vintage example that quilt dealer Julie Silber posted a few months ago. It looks to be appliqued...and round. Roundish.
UPDATE: I should have asked Merikay Waldvogel before I posted this.
It's from the Laura Wheeler/Alice Brooks syndicate. Link of Friendship
published in 1944.
And one more version: