The control numbers - Varieties

A copy of a 10 cts Cadete stamp with a missing first
digit from the first printings (six-figured numbers).

A pair of the 15 cts Vaquer, type Ia, showing a
double-printed number on the left stamp only.

A block of four of the of the 15 cts Vaquer type I, showing a jump in the numbering:
A 016,031 on the upper stamps and A 017,031 on the lower copies.
Double signed A.ROIG|BARCELONA (i.e. Antonio Roig Soler, 1881-1970,
physician, stamp dealer and philatelic expert).