I can't quite read her inscribed plate, and a Roman or normal date doesn't appear to match.
JENOVA MADE IN ??? ALL RIGHTS RESERVED 1999 POWER COMPANY LIMITED
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A higher-resolution version of the FMV featuring Jenova's helmet can be seen in the intro of "Distance", the FFVII:AC "making-of" featurette that's included on both the Japanese "Advent Pieces" bonus disk and the one included with the English-language version. Here is the best screenshot we could take of Jenova's helmet, as it appears in "Distance":
MADE IN HONG KONG ALL RIGHTS RESERVED 1996 SQUER COMPANY LIMITED