Clearspace Masseys being the exception to the rule, Ha! They run on an almost entirely closed system with the only venting to the atmosphere taking place inside the frame. They are even air tight to the extent that if any of the gaskets under the cover plates in the upper part of the frame are compromised, the hammer wont run properly. I would say that one of those fine machines could spend most of its lifetime outdoors and as long as the rust were removed from the ram and the oil supply in the foot was replenished, would function perfectly. I have recently been servicing a Nazel 3B that spent only one winter outdoors and suffered great damage, the Beche is much more similar to a Nazel than a Massey. I've also been working on a 6B that is so stuck from being outside that I haven't been able to remove the heads or valves even after months of soaking and gallons of penetrating oil. It's just a little too large to try to heat up.