Spare M-100 Door

Steve (slz) also included a third (gray) door with the two M-100s, should anything happen to one of the other two doors. The ballast is 175W 240V like the others but this door is newer. It's got hex-head screws to secure the door to the housing (which GE started using sometime around 1970-ish) and has a full-core ballast versus the half-core ballasts that the other two have. This also has no weird black canister thing across the lamp socket. The lamp socket is also different. Unglazed porcelain versus glazed (which means it didn't come clean when I scrubbed it).