Modern Head Marks.
These Carriage Bolts can be cut down and re-threaded, as they are Full Body beyond the threads.
There is very light rust in spots; it rubs off on your fingers like "Rust Dust", so it should clean up easily.
This length cannot be shipped flat rate; shipping will be weight- and distance-based. The tiered pricing accommodates the difference between the shipping calculated by dollar value, and the amount dictated by length.