Type II C and D were a little larger than that, but they are the only ones I can come up with.
What about the XIII? It was to be a follow on to the II, but was never built. Looks like the right time frame. Haven’t run down the specs for it.
Looks like the Type XIII were going to be slightly larger than the Type II, so the specs don’t quite match up, but given the dates, that has to be what they were talking about.