mine are coming out (ring gear) 10 41 2 68 ,I know they are the gears the car shipped with ,just trying to break the code, assuming should coincide with rear end housing build date.
pinion stampings are pronounced I see what can be interpreted as 4:10 and 68, not sure of the month and digit order as it relates to.
Pretty cool ,still have the box the 4:88's came in 69 (Milad's) when #2 owner ordered them...4:10's have been in it ever since.
Your ring gear is dated February of 1968.
On pinions, sometimes the month is a bit off from the year. See this attached example. 1 69 on this one.