How old is my ADDO?

From: Richard Weston
Email: Richard Weston@promedlaboratories.co.uk

Comments

Can anyone assist? We have discovered an old mechanical adding machine in our basement. It is an ADDO made in England by AGRELL MACHINE Co. Ltd. On a plate there is inscribed Mod.9. and underneath this E61644. It has 77 keys with figures (including ¼, ½, ¾ ) and 6 red keys. It weighs approx. 11Kg. It was covered with its original canvas cover. The machine itself is in excellent condition but the cover has seen better days! I would like to have an idea of its year of manufacture and its approx. value. (if any ) I can email a photo if anyone needs more detail. Thanks for looking Richard. United Kingdom