Not sure about the stamp, but looked up the trans code and it came up as lsd jdm zc. And after reading a few different links its supposedly super rare.

A few different sites said the stamp usually wears off over the years and that its not uncommon to not have it, I havent looked myself..

But I know its lsd lol, I have the TWO strips of rubber behind my job on the ground haha...

I may have found a longblock, hopefully the deal goes thri so I can keep this trans...

Yeah, these are only going up in value... I have only found one online, and now 2 being you have one..lol.