yes, that was one of my 'nots' the other was the flat polished base, I don't know if that was a finish they used, I've only seen pieces with a nicely ground pontil mark (but I haven't seen that many and they might have deployed many techniques I guess), the other was that the splotches don't look right for Prachen.
But....I could be wrong - it's just not the first place I'd start looking.
Maybe Polish? something produced for LSA perhaps?
m