Fill in shaft; upper fill in lower chamber; fill in vaulted chamber. Coins: 29 April 1937 #1-#8 5 May 1937 #1-#27 26 May 1937 #1-#12 27 May 1937 #1-#10 28 May 1937 #1-#6 24 March 1938 #3-#7 12 June 1939 ... Late 4th c. A.D.