. . . 18 jewel 30T2SC movement.

The standard version - which accounted for 99% of production - has 16 jewels. Omega offered to upgrade the movement to 18 jewels; two customers - the Brazilian agent and the RCAF - took them up on it.
The additional jewels are in the bridge and plate supporting the center wheel.

Unusually, they are not ruby red - they're clear.
Art