rare hard to find vintage Red Poppy pattern coasters, Halls china dinnerware go along set

I've never found COASTERS in Hall's Red Poppy pattern before, and I don't know the years these coasters were made. They're vintage for sure, but the mid century vintage or the 1990s remakes? I just don't know.

This is a set of eight coasters, all in good clean condition though somewhat yellowed on the ivory background. They're a soft, rubbery material without makers marks.