Russian educational preserved specimen human thyroid section
This is a very unusual item. It is a preserved section of a human thyroid gland. I am not sure how this has been preserved, but it appears to be mounted in a gelatine like substance in a glass box.
The label says "451 Thyroid Gland". On the reverse it seems to translate as "checked out" with a date that appears to be 1978. This came from a collection of Russian medical / biological models and specimens, probably from a university.
The box measures 12.5cm x 10cm and seems to have a metal loop for hanging the specimen.