Lancaster 600 "Big six"
I first recognized this saw in a group picture in an advertisement by Lancaster saws. I saw the 600 or as it was advertised as, "Big Six" the largest engine, because I am drawn to the gear driven. Finding it was a real treat to say the least in a complete, non-abused condition.
This saw was made in 1957 and was part of a series of saws produced.
It has a 6.45 cu WestBend engine and has a 2:1 gear reduction gear drive system.  It has not been run yet and I hope to have it on the bench later this year. The basic engine parts/pieces are pretty standard across the board for these era saws and luckily all of the sand cast specific parts to this saw are all SOLID!  I am really looking forward to seeing how it pulls in big wood.  Being built in Lancaster PA, I doubt it's ultimate destination was the big timber on the west coast but the way it is powered I am sure it was intended for some of the bigger oak/hickory stands here in the east coast hard woods.
It seems to have a good start to a design but had some simple user friendly issues that were common in these era saws by newer chainsaw manufacturers. One is the air filtration accessibility and the thinner style castings which would have been an issue for it being a commercially used saw.