Sorry continuous feed is the wrong word then, I didn’t mean automatic, although that would be indeed make a very special offering. Twist lead advancement might be a more accurate description. By continuous I meant there’s no fixed increment length, but one can continuously rotate and advance as much lead as desired. Uchida Drawing Sharp *, Papermate Sharpwriter and All-American pencils fit this description. From my limited knowledge, the continuous twist mechanism is most often seen on 1.2 - 2.0mm pencils. 0.5 and 0.7mm ‚twist’ pencils often only use twist for activation and lead is still advanced by ratchet mechanism, consequently lead is advanced at intervals.

Do Uchida really have continuous feed pencils? I haven’t heard of them yet. However, since there is no German distributor for Uchida’s drawing items very few websites are my only source. How is their quality? If I remember correctly the continuous feed pencils which were available in Germany – first and foremost Staedtler’s Marsmatic and Faber Castell’s alpha-matic and TK-matic models – were prone to problems (but this doesn’t keep them from fetching tremendous prices, e.g. on eBay).