Reddit reviews Singer 115/175 Sewing Machine with RAF Decals- SEW Ready- Made in Monza, Italy

Example one: the Singer 193 and its sibling models. I know that they exist, it looks like they're straight stitch machines, and from this potato-quality manual cover I know which is which (and that they're probably two pairs of similar machines in old-style and new-style bodies, but very counter-intuitively named). And that's it. I've seen one in my regional classifieds twice, and can't help wondering if it's the same machine (although given my location it may be two separate imports from Australia).

Example two: the Singer website has this manual for a Singer 115 from the 50s or 60s which bears absolutely no relationship to the Singer model everyone knows as a 115, which was made until the 20s. It's also a cast iron straight stitch machine, but it has an oscillating hook mechanism and a stitch length dial just like a 15, but the tension on the side like every machine except the 15 and the (actual) 115. And a plastic knob for dropping feed dogs. My theory is that this is some regional factory carelessly reusing an old model number, but I haven't been able to find any shred of information about this machine. Holy shit, while I was looking stuff up for this comment I found this listing, which shows this exact machine and confirms that it also comes from the Monza factory in Italy. So I learned something today. :)

These are obscure to me, but for all I know you can't throw a brick in Italy without hitting one.