Here are two images from the US Space and Rocket Center in Huntsville (off a web page...not my photos). One image is from a Redstone balastic missile display, the other as a Mercury Redstone display.

That raised circle on your model appears to be modeling what appears to be the pivot pin for the control vane.

Earl

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__________________
Earl L. Cagle, Jr.
NAR# 29523
TRA# 962
SAM# 73
Owner/Producer
Point 39 Productions

Rocket-Brained Since 1970