I would put them in the dishwasher but not the dry cycle. It's that heat plus any detergent residue that clouds glass and dulls dishes And I knew 2 families that had a dishwasher in the 40's.

I don't know where I get my information that I seem to have in my head about Coronado, several sources really. Some of it comes from someone who did a video report pre-internet that I have seen, There does seem to be a dearth of information about Coronado. So I think this might be a good place to put out what I think I know, and maybe some one who does the research can correct it. Coronado was a little ambitious company that wanted to be a part of the modern industrialization of the 1800s, in a large part led by Singer, but they did not set out to be a Singer cloning company; They were into metal work. They had a small plant (picture a brick warehouse with a small foundry and a work yard). They were from the start looking for a good product that would make them good money. It didn't go very well; they did piece work, but their main stay, low profit products were toys. They were looking for a solid product line when the sewing machine opportunity arrived, which they enthusiastically dived into. They got rid of all their non sewing machine making tooling and they made their first sewing machines in house. At that time they decided that they needed a "brand name". The owner was aware of the conquistador Coronado, and he was infatuated with the Southwest though he had never been there, but mainly he like the way it sounded: "It's a Coronado". Many people do not realize the high drama around sewing machines. Sewing machines led the industrial revolution, especially about machines and factories. Singer might be said to be the first multi-notional :-), and of course while their patents were in force, they had a monopoly. When the patent monopoly ended, a number of firms jumped in the sewing machine manufacturing game, little guys. So then, National Sewing Machine sets out to consolidate American, non-Singer sewing machine manufacturing. Singer's scale and internationalism as well as National Sewing Machine's name made it plausibly a patriotic business operation, but I think it was simple anti-competitive market consolidation. So after WWII National Sewing Machine's function is taken over by Brother, and National Sewing Machine goes out of business. I would not be surprised if National Sewing Machine and Brother had major stockholders in common at that time. So Coronado was all in on being a sewing machine manufacturer, but was not really set up for such mass production, and were approached by National Sewing Machine to have National Sewing Machine make their machines. They didn't really want National Sewing Machine to make their sewing machines, but could see that they would never be able to compete and stay afloat, so they made the deal to badge their machines. This was in the 1800s. All the other cloning companies were bought up or went out of business. Coronado survived, but turned basically into a sales company, but they had a solid contract so they could compete as an indy label. They did make another short lived attempt at doing something on the engineering side. I think the 2 step button holing sewing machine might be the only thing to come out of it. I'm not sure. The only one I have seen anything on is the one I posted about at: https://www.reddit.com/r/SewingMachinePorn/comments/1ahdwvu/missing_from_the_internet_coronado_451409_sm51409a/?utm_source=share&utm_medium=web2x&context=3 This is an improved rewrite of a post I made there. This is also the machine where I first made note of Coronado, back in the late 1960s or early 1970s. I was a kid. Is this a two step button holer unicorn? If anyone knows of another, let me know .. or where a manual to this machine, a #45-1409, S.M,5-1409A can be found . Some investigative reporter wanted to know what happened to Coronado when the department stores closed and the Coronado machines disappeared from the market. He tracked the company down to a one room office in some low rent office building. He finally got a hold of the man running the place, who was seemingly well into retirement. At some point the owner just made a contract with minor department store companies to do the selling and to furnish them with machines made by his suppliers, and he put the business on auto-pilot.

Any sewing machine repair place should stock belts. Take the old on with you to get one the right length. If you don't have the old one, use a string around the pulley and wheel to determine length. The motor mount should have some play in it to allow you to install the new one, then tighten it to the correct tension. For optimum sewing, it should be as loose as you can make it, yet not slip on pulley or wheel.

Annie suggested to another person contacting this guy: http://whitesewingcenter.com/contactme.php#E-MAIL