I tried finding the answer but am still searching. I know the Ocean-1 is similar to the Grovana diver and the Debaufre Aircraft-8 is the same as one put out by Revue Thommen which is owned by Grovana. Grovana does private label watches and most likely the Ocean-1 and the Aircraft-8 are made by them. The rest are probably made by another private label watchmaker. Several factories could be involved. Steinhart does offer really good customer service from what I read and the same goes for Debaufre.
I really like the Gold LE too. I don't think you could go wrong with either watch.