van Dam FG19 MNHOG strip of 5 with two very rare errors

Description

Van Dam FG19 strip of five MNHOG containing two errors where the incorrect numerals were erased and replaced.
Very unique and very rare error. Only one other example of this error is known to exist in only a single stamp, not a strip of five with two consecutive errors.
This sheet started out right until the numbering process had begun. The printer accidentally started the serial number sequence at 334300, then 334301. Realizing that an error had been made, the printer erased the first two numbers and re-printed them properly as 334301 and 334302.
Caris Identifiers CAG 19 M5h containing CAG 19a M2h (Where CA refers to Canada “Federal” and G refers to Gas Inspection and 19 refers to the issue of the 50c 1897 Victoria with Red Control Numbers. M5h refers to a multiple of 5 horizontal.) CAG 19a refers to the same as above with the addition of the suffix “a” which refers to “identify a unique variety that falls outside the criteria of the suffixes which are dramatic and usually more desirable as collector's items”. The suffix “a” in the stamps refers to: "One or more of the numeral erased and corrected by the printer".
The only known example to exist besides this one is outlined in CARIS being a single stamp with the control number 848.