This very rare, early Aciera is similar in many respects to the F12 and F1, but based on a round overarm  suggesting a production date during the 1930s or early 1940s. Fitted with a neat, very well supported vertical head, an inclinable table and other accessories to help in the production of small but complex parts there is no evidence of how it might have been driven - an entirely separate, side-mounted countershaft of some sort being necessary. If you have a similar model, or literature about it, the writer would be interested to hear from you..