One of the first coins I owned was an antoninianus of Probus
Emperor on horseback slaying some unfortunate fellow
I bought it for a few dollars away back in 1977
My brother (MARCVS OBLIVIVS) told me he could "fix" it ie remove the crud on it
When he brought it back I was horrified
He not only removed the crud but most of the patina as well
Well I was young but not as dumb as I looked back then
I swallowed hard and thanked him for his efforts ......
I think I may leave this one well enough alone
Gives it a venerable look
Emperor Probus (AD 278-82) Billon Antoninianus
Obv. IMP C M AVR PROBVS P F AVG
Helmeted radiate and cuirassed bust of Probus left
holding spear over right shoulder and shield on left
Rv. VIRTVS PROBI AVG
Probus on horseback right slaying some unfortunate fellow beneath KAΔ in exergue
Serdica mint
3.98 grams 22-3mm
RIC 877 D

