Royal Marine Association Badges & Economy WW2

[billy]

Just acquired these within a group, the Association badges have numbers on rear though one ground off? Help to get badge into buttonhole? Looks to start with a "5" ends "0" or "8" ?? This being the round one with Red border and made by Fattorini Regent Street Birmingham, the other being the Regimental badge and number is "24537", another on chain blank to rear.

Plastic Economy, how does one differentiate "Blue Black" from "Black" this looks Black but if used wouldn't the Sun bleach them to appear bluish/black? There is a vast difference in Price between a Black one and a Bluish Black? and if you cannot tell the difference poses a problem! Not that I'm selling but would like to know? and would like to see them side by side to compare? To see what it is I'm missing? Am not colour blind but this has me baffled!

Anyhow hope you enjoy these and interested to know if they could be named to someone