You have there an Epiphone Sheraton II , made in 1983 by Uncle Mat.
I too have one and there are many similarities between this and the Vox 25 Standard , made around the same time.
I have one of those 2
Everything in the photos is original.
It is widely accepted that the Vox Standard, and custom for that matter, were made by Matsumoku and this Epiphone screams 'uncle mat'.
Mine is also a brown burst, which looks great in the flesh.
I realise this is an old post but thought I'd chip in to clarify matters.