[patrickt]

If this is correct, it works:
"Manufacturer (1) — номер завода производителя. Например, 7 — Foxconn.
Condition (2) — состояние устройства. Новое — 0, восстановленное — 1.
Device (3-4) — устройство. Например, Kindle Fire HD (2013) — D2, Kindle (2014) — C6, Kindle Voyage — 13, Fire TV — 90.
Hardware Revision (5-6) — версия компонентов.
Unit Revision (7-8) — версия изделия.
Year Manufactured (9) — последняя цифра года производства. Например, 2 — 2012, 3 — 2013, 4 — 2014 и т.д.
Week Manufactured (10-11) — номер недели производства (от 01 до 52).
Day Manufactured (12) —день недели производства (от 1 до 7).
Serial Number (13-16) — номер изделия уникальный в рамках одного дня производства."

All three of my Paperwhites are Paperwhite 3 and start with G090. The first page suggested is out-of-date and didn't work. I know I got one Paperwhite from Amazon.mx early this year and that works using the 9th numeral as the year. That system shows the other two as 2016 and 2015. I think that works. It's get a little murky because at least one is a replacement under warrenty for one that developed a hot spot.

The USAF taught me Russian but that was 50 years ago.
Thanks.