"MD" – Kadashevsky Mint in Moscow
"ND" – Nabarazny Copper Mint
Very scarce type without "CPB" under portrait and reeded edge! See the extra image for a regular type with "CPB" under portrait (not in my collection)
Scarce "Moscow" Type
1728 PETER II POLTINA VERY VERY RARE Item number: 180110791811 $4,500.00 May-04-07