In general I'd agree with the others but now that the change to the plastic licence and the English language certification have happened, there is not much that will affect a "Restricted" Certificate. I have used one for over 15 years with no problem. As you have a JAA licence the number is not likely to change under EASA unless you change your State of issue.
A point to note is that the FAA Pilot Certificate includes no RT privileges outside the USA and you need a FCC Restricted Radiotelephone Certificate as well to operate in other countries. You can get that on line for about $60.