51. Every person who is guilty of an offence contemplated in this division is liable, in addition to costs,(1) for a first offence, to a fine of not less than $100 nor more than $1 000 in the case of a natural person, and, on failure to pay, to imprisonment for not more than three months, or in the case of an artificial person, to a fine of not less than $500 nor more than $5 000;
(2) for any subsequent offence, to a fine of not less than $200 nor more than $2 000 in the case of a natural person, and on failure to pay, to imprisonment for not more than six months, or in the case of an artificial person, to a fine of not less than $1 000 nor more than $10 000.