Not necessarily. Kynoch introduced the familiar red & yellow box for nitro in 1936, but batches loaded for specific gunmakers' contracts (H & H, Rigby, etc.) were usually not put up in standard Kynoch packaging. These lots sometimes bore the typical Kynoch date codes, but usually did not. Kynoch for H & H with a yellow label could easily post-date the standard red & yellow box. The date on these is often not coded at all, but simply stamped on the box - for example 101150 would be November 10, 1950. The standard Kynoch date code is a number followed by two letters - day, month, year.