This one crossed the bench today, just blew a few cobwebs off, wiped it down a bit, and move it up to the display. Very low on compression and the starter cup is so badly worn that the pawls will not catch any more. For the time being, it will just sit there and look used. From Mike Acres site I believe this is a model HB.
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The fuel tank and carburetor remain in position, while the engine rotates 90 degrees in either direction as needed for felling cuts.
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From Mike Acres site, the HB was an improved version of the HA and introduced the direct drive chainsaw to the world.
Mark