Cannon at Saltonstall Plaza - Watertown, Massachusetts, USA. Described online as follows: "32 pounder Navy guns of 57 hundredweight. They were made by Cyrus Alger and Co. in South Boston, MA, in 1849. The inspector was AAH, most probably Alexander Harwood, a naval officer. There is no apparent record of ship service history on the pair. They are registered under numbers 520 and 521, respectively."
<a href="//commons.wikimedia.org/wiki/User:Daderot" title="User:Daderot">Daderot</a>
<span class="int-own-work" lang="en">Own work</span>