Many thanks to SWLing Post contributor, Dan Robinson, who notes:
The amazing streak of rare radios, never before seen on Ebay or rarely seen there, continues, with the appearance of this Nems-Clarke 1510A receiver.
I attempted to find this radio in the Osterman guide to no avail — it’s not in there, unless I missed it. There are a few informational pages about Nems Clarke on the Internet (see below):