I've seen an upsurge in the interest for razors made in the same year and quarter as somebody's birth, but I have some remarks and a question. Gillette razors have been manufactured with date codes from about 1950 or so marked by a letter (indicating manufacture year) and a number (indicating the quarter in which it was produced) for example K 4 is a razor made in 1965 in the fourth quarter. My question is if anybody knows whether the quarters used by Gillette on their razors followed a calendar year or a fiscal year with different beginning points? Some fiscal years used to start as early as July, so if somebody decided to buy a buy a razor for their birth year they'd need to adjust by six months. I wondered if anyone had any other info.