Vintage Hamilton Railway Special 992B RR Pocket Watch 21j 16s 10K. Intact screen

Hamilton 992B RR Pocket Watch 21j 16s 10K. This was inherited by my dad, so I do not have much information on it. Screen is intact, not cracked. The pictures show a line thru the face glass, but is actually the inside that is all crackled all the way aroud the face on the watch, but only inside.