Now, this is neat, and I'm not surprised that it's manufactured by Seiko. A 32768Hz oscillator chip that uses a 16MHz-range AT-cut crystal for a completely different temperature curve than you'd get from a tuning fork crystal: http://www.npc.co.jp/en/news/release/2012/11/28/78/ The principle of the MM5369 lives on, almost half a century later! That was a chip that started with a 3.579MHz colorburst crystal and made 60Hz out. MM5369 was discontinued decades ago, NTSC is dead for several years, but 3.579MHz crystals still readily available I see. Tim N3QE