Russian Mortar?

[Pat6686]

Wondered if anyone can recognise this mortar.It's obviously a 50mm but markings don't give much away. the nose is bakelite and marked 482-42 and Mn followed by a diamond symbol.
It's in relic condition and contains no charge although percussion cap intact.

 

[Mrfuze]

It is the 50mm HE mortar round with the " MP " nose fuze on it (cyrillic), probably WW II
Mrfuze, USA

 

[toddyq]

5cm HE mortar O-822

 

[Pat6686]

Thanks MrFuze. Not an expert on this type of ordnance.
A pleasure to hear from someone who is.

 

[Pat6686]

Also thanks a lot toddyq.
Excellent to have a diagram of this item.
Btw, although the HE has been removed, is there a safe way of determining if the propellant has.
Not sure if this is a potential hazard.