>>2001263so yeah, basically, to adjust that seatpost clamp you need two spanners. It's also a steel post so it's a ~100-200 gram weight penalty, and it won't flex to absorb road buzz like a nice alluminium one piece post does.
It's also a nut to put the seat up and down, maybe the bolt is notched and fits into a slot in the frame, so, one spanner.
still spanners are way fucking heavier than allen keys. A nice bike, even from the 80s, will be adjusted by allen keys (except probably the crank bolt). Definitely to put the seat up/down, and forward/back. When you see nuts for wrenches, it's a sign of a cheap, low quality, department store bike.
It's extremely rare to see a bike that is vintage, with old standards, (pre 80s) and actually nice.
