1870.
Is that bottom mark a G ?
where are my manners - it's the second variant of the registration mark on UK items, applicable from 1868-1883. Top mark is day of the month, so 17 here. Bottom mark is the month ( ? ) and the right is the Date letter - C for 1870.
The left mark is the " bundle " and the very top mark refers to the category or genre of the item.