Stealing this idea from CU. Since it's Friday the 13th, post your coins with 13 in the date. All coins welcome
Here is a coin minted during COS XIII (13th consulship) of emperor Domitian. Roman numeral 13 is in the reverse legend. Domitian AR Denarius 19mm. 3.10g. Rome Mint 87 A.D. Laureate head, r. IMP CAES DOMIT AVG GERM P M TR P VII Minerva advancing r., brandishing javelin and holding shield on prow of ship, eagle at feet. IMP XIIII COS XIII CENS P P P RIC II 92; RSC II 218