Small Celadon Green Five Sided Column Vase / No mark

This is an interesting little vase. It's 4 3/4" tall and 2 1/2 - 3" in diameter. The shape is five columns on their pedestals. It's heavy for it's size and has a nice shaded celadon green glaze. There's a couple drip glaze misses at the bottom but no damage. The other strange thing is is has bits of charred wood fused to the glaze at the inside bottom. I thought it was dirt but it's not. Any thoughts ?? -Mike-