My grandad had one of the professional Mac climbing saws, still sits in my grandma's shed...it runs great, but has a cracked clutch/drum. I wanted it but I need a non running saw like a hole in the head...but back on topic..I think early Macs were awesome, the ones they made right before Chapter 11 like my 3200 were pretty crappy. My grandad asked his to do stuff most of us wouldn't ask of an 009 or 017 or other small quality saw and it performed. It looks like a climbing saw but pre chain brake...how old is that 610...if it's an old one it's probably pretty awesome!