While they likely won’t appeal to the OP as much as more modern machines I simply love my working antiques.
At work I use an Adler 30 industrial machine that is at least 100 years old (we aren’t quite sure how old). I can sew anything leather up to 3/8 of an inch thick, and the presser foot swivels 360 degrees which is heavenly for tight spaces. It’s an industrial sewing machine, intended for working on footwear and leather. Since I’m a cobbler it’s what I need. Just straight stitch, can’t even reverse (you swivel the foot 180 degrees to go backward). Entirely treadle powered (at one point it was electrified, then the mod was reversed) but that’s a plus, as you can go real fast if you want or really really s-l-o-w. Downside is that it’s powerful enough that if you tug at the wrong moment the needle hits the footplace instead of engaging bobbin thread and that downstroke is forceful enough the needle doesn’t bend or break it shatters into multiple pieces. Also, it will tear up delicate fabrics but then, it’s an industrial leather sewing machine.
At home I have a Singer treadle machine from 1910. Just forward and reverse. Sews everything from lace to leather.
At work we just got another treadle machine/working antique - well, it will be another working antique when I’m done with it. One of the downsides of working with the antiques is that you sort of wind up doing repairs yourself. Parts are still available for all these models, they take standard needles, but a lot of repair shops don’t seem to want to deal with them or even know what the hell they’re doing. The “new” Singer we got was supposedly repaired by a shop but they didn’t oil the treadle mechanism, just the “sewing machine” (idiots, the treadle is part of the machine, it’s the “motor!”), didn’t put on a drive belt “because you’re going to electrify this, right? But we don’t do that, you’ll have to put a motor on yourself”, and used the wrong type of shuttle hook in the bobbin compartment. Oh, and they didn’t clean all the lint and thread out of workings, basically ignoring anything that wasn’t around the needle mechanism. I dug out a couple decades of lint and thread, oiled the sucker up (including the treadle - people really forget there are moving parts under the working platform), pried out the wrong part, ordered the correct bit, made a new drive belt, and hooked up the treadle to the drive wheel. Once we get the missing parts in and installed she’ll be a sweet machine.
No, we don’t want to electrify our treadles. For what we do we don’t need speed, we need some precision and the ability to drive through leather.
Anyhow, they sure are durable. The Adler has, as near as we can determine, been in continuous use since it was first purchased (needless to say, the original owner is gone). I’ve had my home singer for 25 years now, and clearly was used prior to my acquiring it as it had the usual thread/lint accumulation. It wasn’t just an ornament in someone’s living room. It’s 102 years old this year.