The second 2 drachmai coin on my collection has the crowned arms (shield with cross) with the defenders of the Crown and the portrait of young King Constantine B, who reigned from 1964 to 1973.
The lettering
Obverse:
ΒaCΙλΕΙΟΝ ΤΗC ΕλλaΔΟC = KINGDOM OF GREECE
21 aΠΡΙλΙΟΥ 1967 = APRIL 21, 1967
2 ΔΡaΧΜaΙ = 2 DRACHMAI
Reverse:
ΚωΝCΤaΝΤΙΝΟC ΒaCΙλΕΥC ΤωΝ ΕλλΗΝωΝ = CONSTANTINE KING OF THE GREEKS
1971 = 1971
The coin
This isn't a standard circulation coin, but a commemorative one from the Third Modern Drachma coin period. It was around for 3 years, 1971-1973. It is made of nickel copper-nickel, weighs 6.1 gr, has a diameter of 24 mm and a thickness of 1.88 mm.
And here is the link to its Numista page: 2 Drachmai - Constantine II National Revolution; Regime of the Colonels