I am not familiar with that exact product number, but it might well be a black NMB Hi-Tek. If the switches are clicky, it probably is ("T"=tactile and the "+" usually indicates the click).
If you remove a key cap, be very careful. They are hard to get off and you need to do it from the sides - not the corners. Also, be careful not to lose the spring or bend any of the delicate "fingers" of the contacts when you put it back together.