Yes, the Romans used iron and steel weapons, at least in historical times.
Bronze ones would have been ceremonial or decorative objects, which is possible.
This doesn’t look like a Roman object especially. It looks like a Hellenistic (late Greek) inspired thing, which could be Roman or could be a lot of other things from around the Mediterranean. Or it could have been someones 19th century souvenir from a trip to Europe.
Ogmios, the Celtic Hercules, could be the critter on this thing, his club brandished above his head.
Rare treasure found in Suffolk depicts medieval ‘Wild Man’
http://www.bbc.com/news/uk-england-suffolk-35050026
http://ichef-1.bbci.co.uk/news/320/cpsprodpb/10BA9/production/_87112586_2014t413_spoon_knop-2.jpg
http://www.telegraph.co.uk/news/newstopics/howaboutthat/11591904/Giant-chalk-hillside-figure-in-Cerne-Abbas-censored-for-American-audience.html
