An old 75mm anti-aircraft gun in the old Oulu garrison (now in civilian use) in the Intiö district of Oulu, Finland. The weapon seems to be British QF 3 inch 20 cwt (Mark III), according to the markings.
<a href="//commons.wikimedia.org/wiki/User:Methem" title="User:Methem">Methem</a> (Mikko J. Putkonen)
<span class="int-own-work" lang="en">Own work</span>