It does look like Blassii, but not 100% sure. Need to see "new" leaves after it grows. Remember= Crypts look different when grown above water or sometimes in different water.
I think I had blassii at 1 time. As I recall it had red undersides & wider looking leaves. Hard to tell, but there are no ugly crypts IMO. I like the speckly leaf on yours.
I'm pretty sure another reason why it was mislabeled was because they did actually have the C. blassii in another tank that was just solid colors. This one reminds me of the waterlemon skin. New leaves coming in are keeping the pattern but much smaller. Once I have enough to spare I'll pass it on to our club president he does a lot of emersed growth.