It does look like a crypt to me. I don't know which one though. I imagine the trouble you've had is because there is such a variety of leaf sizes & shapes possible depending on the conditions. Like a cute 6" plant becomes a 12" monster tank buster with an increase in light.
I like the 2-toned leaves you have. I have a C. wendtii variety (I think) that does something similar. Whatever crypt you have it looks good and seems to be quite healthy. Sorry I'm not more help.