There are three sorts of Conway Stewart Scribe. All are the same shape and dimensions but there the similarity ends. The 330 and the 333 are black hard rubber pens, mass produced doubtless in the thousands. They appear to have been bought by companies for their clerks to use. Though they were built to a price, they are not bad pens. They have some nice engine chasing and they are good writers, like all Conway Stewarts. They remain low-priced because they are so common.
The other Scribe is the 336. These are casein pens in delightful colour patterns, some bright, others more subtle. They are not so common and some patterns are quite rare and therefore more valuable. As a writer, it’s no different from its poorer relations but as a collector’s item it’s much more desirable.
If you want to see photographs of these pens, go to http://jonathandonahaye.conwaystewart.info/index.html, Jonathan Donahaye’s site. Though Jonathan is sadly no longer with us, his site is still maintained though not updated. Research has moved on in the years since Jonathan passed away so not all the information is completely accurate but the photographs and basic dimensions remain a splendid resource.