Not really 'out of mothballs' but... maybe similar vessels about?
"The Paraguayan Navy's Humaitá-class river gunboats may well be regarded as ancient by most modern standards, but their longevity pales into insignificance when compared to that Navy's Capitán Cabral (ex-Triunfo, ex-Adolfo Riquelme), which was first launched in 1907!".
http://wargamingmiscellany.blogspot....r-gunboat.html
http://wargamingmiscellany.blogspot....-gunboats.html