Constellation 398.0876 - caseback query

Hi there - new to this forum and was hoping for some help with a vintage Constellation 398.0876 that I just bought.

Most of the constellations from the time I have seen have the observatory image on the caseback, but this one does not.

Would that indicate that it is not the original caseback? Or are there some original pieces with this caseback out there?

Thanks - any help is gratefully appreciated!