I've taken the following from the original order dated 22.10.1937:
These HJ Heim-Plaketten as they were known, were introduced in October 1937 by Reichsjugendführer von Schirach. They were awarded to NSDAP and state personalities who had been directly involved in the planning and execution/provisioning of buildings and/or funding as part of the Heimbauprogramm (provision or construction of buildings solely for use by the Hitler Youth for weekly meetings/training).
The medallions were awarded by von Schirach and presented to the recipients by the
Gebietsführer (or those designated by him to do so) in the area where the HJ home was located. Suggestions for potential recipients were submitted to the office within the RJF responsible for the programme with the final decision being made by von Schirach.
I have no idea how many were awarded but as Crack said, it was a big programme. These awards wouldn't have been given out willy-nilly though but rather sparingly and only to important people.
Here's a newspaper cutting from 1.11.1937 showing the award:
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Here's a report from 1.9.1938 regarding the award of a Heim-Plakette to the industrialist (Generaldirektor of DEMAG) Dr. Reuter in Duisburg for the provision of a large sum of money. The presentation was made by Gebietsführer Fritz Striewe of
Gebiet Ruhr-Niederrhein:
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