I have a Fanno pruning saw with about a 24-30" curved blade that cuts on the pull stroke. It came quite sharp and cuts well. I also have a Silky Zubat 330mm, which was the largest Zubat model they made at the time. I understand they now make a Zubat in something like 390mm length.
The Silky Zubats are hard chromed for greater corrosion/pitch resistance and lubricity. The teeth are impulse hardened (as I recall, around RC 67, but my memory could be a bit off) so they stay sharp a long time. I like my Silky better but there's nothing wrong with the Fanno.
DancesWithKnives