markings can be hard to spot, you may need to light it from angles
to see them, some dont show up till years later like our main shop anvil, thought it had a stylized S and was from one maker but later found out it was a D Hill fifth foot.
I normally use a pressure washer after initial pictures, then more pix, then wirebrush, then more pix, then dry and more pix, then chalk or flour and more pix