Chris, what do you mean by "PY1"?
I have a two examples with the same green "jasper" ground. Both have a "cracked off" pontil scar with some "crunchiness", and those features are usually taken to indicate 1930s period. But the dome on one of mine is noticeably clearer than the "typical" tinted domes from the 1930s - but it could still be pre-war.