A transmission inspection door off a Jan. 1919 engine is different from the usual late style door in that it has a pressed in ridge near the outer edge, presumably to better bite into the gasket. It is also noticeably thinner than the standard door. Is it a replacement item and has anyone else seen one? Pictured are the standard door and this different piece.
They came after the flat doors from 13-18, they where only for a couple years, I have found them on 17-21 so maybe they where left overs or ??