Hi there,I really like the military toolish look of Hamilton Khaki mechanical field with the decent size of 38mm and the HW movement with the screw in crown. I found some controversial info regarding the size ( is it 38mm w/o the crown or not?) and the type of the crystal ( is it sapphire or mineral?). How is the lume like? Strong , nothing to fancy about or mediocre? Thank you guys!:-!