I have six of these rigid frame plastic clam shell units, 1995-2002. 36-40-42cc. Minor fixes mostly. Hard to beat, since they were all free and most were running for the price of a few maintenance items... carb kit, fuel lines, chain, sprocket and bar.
For the most part a great little saw. A/V versions were also made.
Just keep the E-10 out of them or you'll be sorry.