Неопознанное судно - тип Пионер(2)

This is not a page for any specific vessel.
Below are the photos of different vessels of the same design, which had not been identified (at least, by the name) when uploading.
If you have information about any vessel on these photos, please leave a comment under it.

Design:301 (DDR), Pioner(2) type
Builder:Rostocker Schiffswerft und Maschinenbau AG  
Yard number:3хх / 1ххх