I would like to show you an example of this underprint on a stamp but, as yet, I have been unable to locate one.
Moses, Levy & Co. were Merchants and Wholesale Clothiers (specialising in sailors work wear) and although trading from various locations had their main office at:
2 & 3 Aldgate,
The company was started as Henry Moses and Son and became Moses Levy & Co. when the son, Abraham Lyon Moses (1775-1854) went into business with Abraham Levy (1782-1848).
1864. Unofficial underprint type 38 (over the gum) in black.
a) Vertical underprint, reading upwards
PP120 1d lake-red (SG 43 or G1)
b) Vertical underprint, reading downwards
PP121 1d lake-red (SG 43 or G1)
PP122 2d blue (SG 46 or G3)
PP122A 6d lilac (SG 85 or J72)
PP123 6d violet (SG 109 or J76)
PP124 1s green (SG 101 or J103)