Anyone have a line up of the markings on the bottom of standard German steel bomb gains, want to find out how many types of markings there are. Were these gains blued or black in finish when they came from the factory, most i have seen seem to be shiny brite steel. Lastly were the plastic or bakelite standard bomb gains (not SD2) used for the 17 fuze marked like the steel ones, stamped at the base..