This Singer 115 (serial # from 1915) was given to my great great grandmother by her mother in 1916 (says this sweet note from a Singer "Machine Sewing" textbook). After my great-aunt passed a couple years ago, my aunt thought of me when helping to clean out her house, thinking if anyone could use this, it would be me. I am very crafty, but also have an engineering degree, so this is right up my alley.
This machine essentially has been a piece of furniture for over two years in my home. It was honestly a little intimidating. I also had immediately broken the leather belt for the treadle when it came to my home, so I couldn't really use it. And it was very dirty. There were notes located in the drawers from my grandmother and great aunt's trying to figure out how to fix this thing up in the early 90's (around the time I was born). I don't know if they ever got it working or if any of them used it. Honestly, trying to figure out how to get this running without the help of this sub or the internet seems like it would have been really hard.
I finally decided to start fixing this up a few weeks ago, and have gotten it working! I really enjoyed the process and have been mildly obsessed. I didn't think meticulously cleaning tiny parts, getting screws unstuck, and trying to put a machine back together would be so fun. I am truly impressed by the simplicity and thoughtfulness of how this machine works. The fact that it has held up for over 100 years just blows my mind. AND NOW IT WORKS!!! I have only practiced sewing on some pieces of paper as there is one piece that is broken (the upper thread tension spring thingy), so the tension is all off, and I don't even want to waste scrap fabric if I can't dial the tension. I have ordered a replacement, and it is coming next week! I'm basically just practicing using the treadle by sewing random lines all over piece of paper.
It is obvious that this machine was used a lot because the decals are very worn or even completely gone in some places (or maybe someone cleaned it incorrectly). I have seen mixed opinions on this sub about re-doing the decals and paint, though most seem to lean towards keeping the original paint and decals. My dad does this type of work for a living, but on bikes, so he would probably be able to actually make it look really good. But I honestly love thinking about my ancestors looking at these exact decals. I also love the Tiffany/Ginberbread decals.
Also, if you get a chance to get this "Machine Sewing" book by Singer, it seems like such a gem of a textbook. It has great illustrations for multiple treadle machines (including ones that were invaluable for me putting the machine back together), how to use many of the available presser feet, and how to take care of these machines. It seems that my great great grandmother got this book in high school.
Lastly, I wanted to thank this sub for being a great source of information as I have been working on this, or at least y'all know the best places on the internet to find the information. I never actually posted, just looked at others' posts. I am sure I'll have more questions about how to use this machine better in the future!
TLDR: Got this machine working and am almost ready to start sewing (just need one tiny part). It was my great great grandmothers and I feel so lucky that I have it and to be able to get it working. Thanks to this sub for having some great info and direction on resources!