strange differences on neckplates...

[lordbizarre]

in another topic I've red :
carried the script "Steel Adjustable Neck" as well as "Made In Japan" and a number
so I've checked mine ...and see :
three different neckplates , same brand , although aproximatly same years,
and also two different brands for the same manufacturer ....
electric guitar Arai Diamond 1803T with "steel reinforced neck" and sn 0003411,from my collection
electric guitar Aria Diamond 1803T with"steel adjustable neck" and sn 0053935 (collection Olaf Berhorst)
electric bass Aria Diamond 1820 with "steel adjustable neck" BUT NO "Made In Japan"and sn 0052717 from my collection
electric violin-shaped bass Aria Diamond 1420 with "steel reinforced neck" and sn 2135748 from my collection
...but can't find any logic into the model & serialnumbers and/or brand...
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