Looking for 1950’s or 60’s fantasy young adult books about a magical silver smith in Massachusetts who can time travel and shape shift and enables a young boy to share his adventures.  Author might be Lawson or Dawson.  I have tried the Library of Congress listings of books without success.  The books were available in the San Marino, CA public library into the 1970s or 1980s.

Additional story elements:

The silversmith was an adult during the American revolution. Story elements involve turning into various animals and birds, pirates and participation in the revolution