Nifty pencil shop in NYC - great selection to include a "Red-Blue" (aka "Go"-"No Go") dual head pencil similar to those used by Black Hats during BAC @ Fort McCoy in '86.

Secured a few "red mark" swing lander grades as well as bumps and bruises to body (and ego) - but doubt the BH's pencil was made by Caran d'Ache.

https://www.youtube.com/watch?v=hQF2WK5MwTc

https://cwpencils.com/pages/about-us