For the record, I just want to declare that I generally despise using cottered cranks. I had a few sets as a kid, and they always ended up loose and wobbly, and as many issues as square taper cranksets have, I find them the far superior option.
Now that's out of the way, I should also inform you that I do like the way that they look. They tend to be thin, nicely shaped, and the old chrome (too cheap to buy collectible roadie alloy ones) usually cleans up really nicely. So I'm going to try a set on Mary.
View attachment 192550
These were originally on some American Flyer - branded 10 speed from the '70s. I took them apart, cleaned and inspected them, and then reassembled the drive side, minus one chainring. The "finned" trim pieces are chromed sheet metal, but if this is going to be a classic RRB build, it needs a few geegaws.
View attachment 192552