Ah, the bucking claw came in the mail yesterday, and fit perfectly. Here are a couple shots of me little beauty, taken after we went out and cut a few dinner plates.
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As you can see, mine has the semi-wrap front handle, which I VERY much prefer over the full wrap. (No disrespect to western saws, but I believe I'd take a hacksaw to a full wrap handle.) With the exception of a few machine screws, the saw appears completely original and complete, and I've kicked around the idea of a full restoration (it would be my first). On the other hand, I rather enjoy cutting with it, and it is by no means at the end of its working life!
The bar on the saw is a Pioneer 16" hard-nose, P/N 472142, 3/8" pitch and .058" gauge. I'd like to upgrade to an 18" or 20" sprocket-nose bar and chain, and keep the gauge, which makes things a bit tricky -- .058" doesn't hang on trees any more. But I think a 4+ hp 65cc saw deserves -- and can handle --those big meaty teeth. Anyone have a recommendation?