Here is an unmarked Navy issue Marbles 6” JPSK with its original box for reference. 

Hi,   Thanks, Hyrax222, for that comment—I'd never noticed that before. I'll be more observant from now on.   Nice WT.   GM    

Looks like Al Gore before he invented the internet.

Hello John:   Your 6 inch Marbles JPSK is a genuine Marbles but it is not USGI.  The markings, brass guard, white spacers and bright blade are the easy giveaways.  At least it is not one of the recently made Chinese produced Marbles blades.   You might want to take a look at this thread on the Marbles blades from a few years ago.   HTH.   Regards, Charlie

+1 Double marking—wow!

Many years ago I attended an OMSA or ASMIC/AAMUC National Convention.  At the convention  Ron Fischer indicated to me he had something that I might be interested in.  Ron's wife was a daughter of George Studley.   Ron obtained from George Studley a poster of the ribbons George sold.  I obtained the poster from Ron and today I have pinned it online  for our forum members.  If you have an unknown ribbon on a Studley bar you should now be able to quickly identify the ribbon from the pictures below.  

Rare, unusual?

It was designed for use in a Canteen.

Ordered. Thanks! 

i kind of like that verdigris, goes with the age :)