I have never experienced anything like it..Demaged three coins in one day.. Vespa or Titus denarius, Macrinus denarius and Caligula or Nero as/dupondius cut in half..I'll know more after cleaning..
@DonnaML that was my first thought... I think they were exhumed like this... bad luck, as judging by the breaks, these have been goners for some time...
Or plow damage? I have seen plenty of English coins (ancient to 19thc) broken like this owing to farming...
To me the silver appears to have been damaged. Likely became embrittled due to crystallization during burial. The two bronzes were like cut down on purpose. This was done fairly frequently in areas short of normal coinage. It was done either to provide smaller change or to reduce the coin to a lighter weight standard. SC