You'll be surprised how well a cell phone camera picture will come out. There are several ways to do this.
One trick is to not zoom in all the way. You can take a picture, then zoom in on the picture and crop the area you want to view.
Another way is to take the picture from an angle, this sometimes allows words and designs to be seen easier.
When one attempts to zoom in on a marking without a macro setting the marking becomes blurred. I use my cell phone camera all the time to take pictures of the markings on firearms that I otherwise can't make out. Which is funny as I have an actual digital camera with the macro setting.
You might need someone to hold the item at different angles in different light settings and take a dozen pictures to get the perfect shot.
Also another trick is to take chalk powder, china marker, etc and fill in around the marking, then wipe it off. This will leave the coloring in the low areas allowing it to contrast to the high areas. This is another gun marking trick we use quite frequently. Oh and it's not a permanent process, so it won't ruin anything.
Just some food for thought.....