If you feel like removing the pin and checking, take a look at the back of the safety lever. There should be a "58" scratched into it, only the first 600 or so Swiss Military have it.
I'm a little surprised that, assuming the gun started out with an unrelieved frame, that the right grip does not appear to have a "3" over the "58" that would have been added at the time the frame was relieved. I would add a link to a couple of guns noted as such but the other Luger forum is down at the moment.
Here's the link, but it may not work until the other site is back up -
http://luger.gunboards.com/showthrea...light=relieved