Great find on the collar disc. I dug one last week, artillery F battery, WWI. It was a totally unexpected find in a old yard. Will try and get a pic up. I've thought about hunting logan , quess I need to quit thinking about it.
Logan is a WWI camp which is now Memorial Park in Houston.
It is a city park and not restricted - yet...
The US "tag" is also a collar disc in rough shape.