Welkom hier op Apug/Photrio!
I do not know that model, but in general there were two ways of doing so:
-) printing a flat piece of zink etc. coated steel with a varnish. The same as sheet-metal toys had been printed. By this one can leave free the lettertypes and give them the metal shine. I assume that was done in your sample
-) Emboss lettertypes into a piece of sheet metal or mold lettertypes in metal, then spray paint and then grind or mill the embossed/molded letters a bit, giving them a metal shine. At molded lettertypes instead of flat milling even structured milling was applied giving the letter faces a sparkle.