Strack 81, pl. 1 happens to illustrate a specimen from the same
rev. die as yours, with
portrait left on
obv. He did not notice that the "
scepter" has a point, so should be a "spear".
Strack does think, however, that the usual
snake on the
altar has been omitted on this die. However the top of the
altar protrudes more to the left than to the right. I think the oversize protrusion on the left may include the
snake, which is usually small and shown emerging from the top left of the
altar.