once it's steamed, I'm sure this will be a very pretty blouse, Adamina, however, for accuracy's sake, I would not use the word "rare" to describe it. There were (and are) many many many blouses with hidden front button panels and tucked yokes that were manufactured in the 80s and 90s, by many different companies. It may be difficult to find another
label like this has, but that would not qualify it as rare.
Rare would be finding a blouse like these from Chanel in the 1920s:
I hope this helps.