This is a vintage mold called "kashigata".
In the past, when a person died, it was expensive to give flowers or fresh food so, people made sweets (these are made from soy flour, rice flour and sugar) in the form of flowers, fish etc. These items were then placed on the "butsudan" (family shrine found in the house) for the dead person.
The sweets are for decoration only.
On this mold is a plum blossom sweets mold.
*You can use this mold as food mold to cook.
The details on this mold are really amazing.
It measures 10 cm long x 15 cm wide x 4.3 cm tall. Inside it measures 7.6 x 7cm.