Drawn linked to this fantastic PDF, “Studies in Pen Art”, a scan of a 1914 pamphlet by William Dennis. It has loads of examples of penmanship and advice on techniques and equipment which is pretty much all relevant today - although not perhaps the emphasis on speed; even a commercial letterer today wouldn’t have to produce work as quickly - producing this kind of lettering by hand would be a project in itself these days and so more time would be devoted to it. Still, we all have deadlines and knowing how to work quickly is never a bad idea. The PDF is available for download from the Drawn page - worth a look.
