John,
The original photo in Needham's book clearly shows the plain metal side with
only the pop rivets visible on the top face, a carryover from the similar
HD-6 shield, on close examination. Also, the late type shield has four small
diameter holes in a row in the asbestos face just below the manifolds, which
aren't seen in the Needham pic. The email-grade pic I sent you probably isn't
great.
Best
Peter
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