This looks likely to be a Dutch made Royce Union. Graphics could be hard to find but perhaps you or someone could make them based on what you have. The alternative is what I did. I ended up just going to an
Lettering.com and getting graphics make that were not original to the bike but do have a period correct look.
Here is my built in Japan Royce Union with Graphics from Lettering.com:
This is likely what your head badge looked like.
The graphics on the down tube. Block lettering, gold with a black outline. Also notice that this frame had gold box lining.
Royce Unions were department store bikes. As a result there is not as much out there as there is for old bikes like Peugeot and Raleigh for instance.
They were private label bikes made for Times Square Stores and may have been sold to other department stores around the country as well. Generally, my opinion is the bikes were not bad, but not great either. There is a thread on BikeForums about them.
History of Royce Union Bicycles
For me the diy graphics were more fun, quicker to get to the finish line and less expensive. I do like the graphics on your Royce Union. Whether that will be feasible to replicate, I don't know.
Keep the pictures coming as this project progresses.