The heirs of Antonin KOSTAK

We seek the heirs of Antonin KOSTAK

All we know about him is that in 1936 he was living at 781 Third Avenue, New York.

Do you recognize any of the name?

Can you guide us in any way?

If you have no information, do you know of anyone else, anywhere, where we can ask?

please e-mail me at searchandunite [at] lewinsdlondon [dot] org [dot] uk