It appears to be an original earlier ‘67 sand cast top and bottom and they had the straight leg “R” as well as other different letter shapes/features. The first sand cast lids were natural aluminum finish and the second variation was black crinkle painted like the one in the first post. I can’t tell from the pictures, but the side/edge of the lid should be aluminum finished as well, no crinkle paint. The picture Wedgeman posted is of a die cast, curved leg “R” that was used later in ‘67-‘68.