All you need to do is to write/email to H&H.firstname.lastname@example.org
They would provide the details. But, you need to remember that a serial number can be forged,however competently or incompetently, and there are a lot of forgeries around. Two such guns were offered on this very board.
You could take some very clear photographs and post them here so that our members could take a look and come up with their views.