I have a Kenmore machine from around 1982 or so and I LOVE it (..of the time...)! I found something on one of those links that pointed me in the right direction. I would just go to my local sewing machine repair place (or if there's a Sears store in your area, they have a service center, but that may also take a few weeks to get around to your machine) and turn the machine over to the pros for a few days (or weeks), tell them what you need, and they'll get your machine all lubed up and find some parts for you, and you'll be ready to go!Alex has spent a lifetime in the sewing industry and is considered one of the foremost experts of pioneering machines and their inventors.He has written extensively for trade magazines, radio, television, books and publications world wide.Here's an article listing the Top 5 Best Vintage Singer Models, and many people who collect and sew with vintage Singer machines do love and seek out these particular models.There were a small handful of manufacturers who made "generic" machines in the mid 20th Century (like the Morse pictured above).
Several parts are missing, it's not in great shape, and it's basically non-functionalbut it still is a wonderful piece of family memorabilia, and I love having it in my home.
The company cleverly managed their production from all factories to coincide with the serial number flow.
Very early Singers from the 1850's up until the start of prefix letters in 1900 had two serial numbers.
Actually, there are lots of variables to estimating the worth of an old sewing machine, so let's look at the most important; the make/model and date, the condition, and any extras that may be included with the machine.
There aren't any comprehensive lists for identifying models or manufacture dates for old BERNINA machines available online.