400+ ES, 34 block +1 cold shield with open suffix

So I sniped a synthesized +max es and %es harmonic shield and decided to roll some essenses on it. On my third attempt i got a 403 es shield with +11% to block and +1 to all cold spell skills.

Very hard to PC this one, since it is the 2nd highest ES shield for sale at the time of writing, as well as the only one over 350 es that has block.

Also it's the only shield above 300 es that has both block and +1 cold skill, not just online, but offline as well.

My intuition tells me somewhere in the 10-50 div range, but i'm pretty lost. Ideas?

Link: https://www.pathofexile.com/trade/search/Sanctum/l5mMymQsV