I got this mint rOtring sec-o-mat set in a mixed lot of drawing equipment on eBay. I find the Isograph pens really elegant, but personally I only use Micronorm/Variant pens for my drawings, so I've decided to sell this on. Because these sets are quite rare, and because a new Isograph costs over €20, I figured a starting auction price of €140 seemed more than fair. If I'm lucky, this one will almost pay for the whole lot that I bought. Wish me luck!
Kind of, yes. They came before the Rapidographs, and I prefer them a lot, because they're more maintainable.