Esp 400 series

Updated
Esp 400 series

I'm trying to date this guitar but it only has a four digit serial #. Can anybody help? 

Had three singles and a single ply white pickguard. I have the original neck with rosewood fingerboard be just in storage at the moment. It's is branded ESP series 400. I've just never seen another with only four digits for the serial#. Any help will be appreciated

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