Well, these can be up to 45 priz but not sure they can be that high and still lvl 3, but i know they dont get too high a lvl.
You could do a number of things with somehting like this but I wouldnt consider it a "rare" find as they are actually a pretty common thing if you pick up pally shields a lot.
Now a "rare" to "godly" find is to get one of those 45 priz wiht (2) socks and be Exceptional or eleite so you can Rhyme it and get those bonuses added to the existing 45 priz, or findidng a (4) or (3) once again Elite or even exception so you can make the other runewords in them, one is Sancturary and I forget the other but they take some mid lvl to high runes and are good ones, and one is for Pallys only.
Those shields can also produce up to i beleive 65 EDamage, and 120 AR and have 1-4 sockets which you could also use these runewords with for Melee builds.
Pally shields with rez drop alot, but the high end ones wiht the right # of socks can be pretty rare.
Last season I found a (2) sock wiht 38 Priz and like 118 Defense and made a Rhyme out of it and it did an extremely good job for me going thru Hell.
Also, one of these like the one you have, you could slap 4 Pdiamonds in it and get 76 more priz and have a whoppin 101 Priz in your shield. Now it will have terrible base block, but when you dont have great gear this can allow you to be a very strong character until you find better stuff.