Definitely the last picture...
Monica, I quite understand your difficulty. It took me a little while working it out in real life, and I had the benefit of three dimensions. The cabinet was full of stuff, so I pulled out a big box of material, found no treadle pedal underneath and was really confused. Next I had my head on the floor looking under the cabinet. Only then did it dawn on me that the floor of the cabinet was also the treadle pedal. I couldn't believe there was enough clearance at the sides, but when I had a quick go at treadling there was absolutely no contact with the side panels. I can imagine that there would be a problem here in England with the wood expanding with the damp.
The link that you put up to the auction site was interesting. The price of that machine was 99 zlotys, that was in 2010. The present exchange rate makes that roughly £20. I'll let you all convert that to dollars.
Also, that is a really nice picture that you found of the older machine. I've squinted at the decal in the centre of the bed. It is of an archer, which is what Lucznik means.
Charlee - yes, that's how you pronounce it.
Miriam - it's a promise. I will do a video next time. You might have to wait a few years though.