The Blaster is made of resin, with attachments like the faux neons. I know that most of the blasters of this style were produced without barrels, so to allow easier, more secure fitting into the Officers holsters. The only ones shown in reference pictures are the ones with the sliced barrel (see the Star Wars Chronicles book), but this type of finished blaster can be seen in the Officers holsters, especially in the docking bay control room. It is suspected that there are only an handful like this completed for close up screen use, maybe only 2 or 3. There are a couple of marks on it, but nothing really of a mention.
I acquired it directly from Norman Harrison, so it's history is traceable direct from source. Norman seemed to recall John Stears saying that this Blaster belonged to the Officer who said "TK421, why aren't you at your post?", but for me, it's impossible to tell. It matches his from the screen shots, but who knows.