Hi Snautzer, ref your pic on post #1447.
This detail seems to show a very unusual variation on the G-6 DB605A type cowling bulge. The rear part of the bulge is usually a simple rounded shape that returns to the main fuselage contour, what we see here is a more complex smooth bulge that is a bit like the later smooth-bulge cowlings.
Cheers,
Eng
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