I searched the internet and did not see a manual for this vintage calculator. One might show up eventually on sale if you search at a later time, but that is an old model.
The following ebay site is said to have a complete unit in an original box which is likely to have a manual. You could try contacting the vendor, and offer to purchase a copy of the manual, if there is one inside the box.
https://www.ebay.co.uk/itm/VTG-ADLER-ROYAL-NOVA-1123PD-PRINTING-CALCULATOR-ADDING-MACHINE-BEIGE/333500972479
SOURCE: adler royal 1123pd nova user manual
Here is the link..
http://www.neximaging.com/ProductList.asp?ID=10232
Thank You..
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