[amsat-bb] FT-847, uni-directional or be-directional version?

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Hello, Does somebody know whether one can recognize by the serial number of the  FT-847 whether it is an old, uni-directional or a newer, bi-directional vrsion? A user here in Germany has two FT-847 with serial numbers 3M840064 and OE320084.

73s, Erich, DK1TB

serial number info link: http://www.supercontrol.de/cat/ft847faq/page1.htm#serialnum

The FT-847 was first made in 1998 and the bi-directional problem was fixed that first year... only serial numbers starting with 8C, 8D, 8E, and 8F would be uni-directional.

73, Kevin N4UFO