Cherronesos, Thrace Hemidrachm

Here is one more Greek coin that arrived. It's a Cherronesos, Thrace hemidrachm. I got it for the well-centered lion. I bought this from a well-respected dealer, but one thing that I wonder about are the small lumps in the fields around the lion. Normally, I would wonder if this is evidence of casting, but I have seen this on a few other examples--so perhaps it's corrosion to the coin or die?

Thrace, Cherronesos hemidrachm, 400-350 BC
Rev: Bee, Size: 13 mm, Weight: 2.35g

The test cuts do appear to be really cut into the metal, and the small pits (arrow) also resemble porosity I've seen on crystallized silver coins--evidence of old age. Have you seen anything silmilar on Greek silver?