His 1969 road jersey was marked with 40 as well. Here is a comparator, although I admittedly don't know if there were any tagging changes from 1969 to 1970 and whether there is a difference in value between the two years (would assume 1969 was worth more absent better performance or some other key event in 1970)
https://www.greyflannelauctions.com/...ame_used_road_