Mortar in Batey ha-Osef museum, Tel Aviv, Israel. Thourh labeled as "British 120-mm mortar", it's probably Soviet 120 mm mortar M1938.
<a href="//commons.wikimedia.org/wiki/User:Bukvoed" title="User:Bukvoed">Bukvoed</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>