I wouldn't think so. There's no good (or any?) way to change the time on the brick.* It could be a faux-Belton, i.e., two delay chips and their accompanying circuitry. There's a couple designs like that (Merlin Blencowe has some that sound good).
My money's on FV-1 or something. A lot of the new reverbs with more than one knob use those. EDIT: Listening more, I think kwaping is right, and I'm thinking it's either a couple delay chips or some other sorcery.
Looking forward to you thoughts. Particularly, it would be great to hear how the reverb mixes with the dry signal. Some Belton-Brick types kinda have a 'seperation' thing to them, where the reverb and the dry signal are somehow disconected from each other. And then there are the other types, where they seem to meld perfectly. It would be interesting to know which type the Silver Spring is. Cheers!