I've never heard of a "Made in China" model having a trigger voltage over 10V, although I can't be absolutely categoric. There's a table of trigger voltages here: http://www.botzilla.com/photo/strobeVolts.html

You can test the trigger voltage if you have a multimeter - there's a video here: http://www.youtube.com/watch?v=yo9tPDCsE7s

I would frankly be very surprised indeed if yours wasn't safe.

There aren't many old guns I think it's worth using, but this is one of them!