Love either the omega sea master 300 spectre or the lorier neptune

Maybe something from Tudor. i have some more budget recommendations:

Boldr odyssey 

Out Of Order watch because they come with a patina out of the box.  

loriar Neptune 

Some oris I don’t know there catalog well

a Baltic 

i would go with the boldr personally 

Swatch moonswatch

It's ceramic but it's hard to come by for a good price unless you live by a store that has it. It comes with a velcro strap I would replace it with leather or a nato. It's based on the Omega Speedmaster