May be of Hellenistic origin when cistern system went out of use.
For a general note on the cistern see Nb. ΟΕ III, pp. 246 ff.
Objects from B 586 various depths (no subdivision): S 2324-S 2330,
P 34894, ... Late 2nd-early 6th c. A.D ... Coins:
2 June 1937 #1
7 June 1937 #1-#7
11 June 1937 #1-#4 (from Dump) ...
.1=Layer VIII
.2=Layer VII ... IV
.6=Layer III
.7=Layer