In the early to late 70s (1983 at the very latest; that's when the motors were listed as "discontinued" in the price sheet). FSI packed its 21mm x 70mm motors (A4 through D6) in little red boxes.

I didn't get a lot of motors in these sizes. Maybe half a dozen boxes. Two survived the decades. Both are intact but in shabby shape. One lived in my range box for more than two decades, acting as an igniter storage box.

I scanned the flattened out boxes this afternoon, and just now took pictures:








The A4-2 box was marked ".90" in pen, the C4-4 ".95". I think. The ink is very faded.

I don't remember if FSI ever packed 21mm x 70mm motors in plastic bags (as were all the other motors), or if that size was simply dropped.