Same here. I mark all my eggs with similar info on each egg as you, with permanent sharpie markers. I bought a variety pack with about 12 different colors, I love them. They are designated as my egg markers ONLY. My family is not allowed to use them lol. I mark separate eggs and separate batches with different colors, comes in especially handy when I am doing staggered hatches.
That's funny because I have the vanity pack, different Colors for the different coops lol