Judy, Martin made three different heart pans (6, 9, and 12 cup) and I would think they are not bottom gated but don't know. If you see a gated pan it's old. My one with cutouts seems quite old by the quality of the casting and its patina. It definitely is not a new reproduction as are so widely seen by John Wright and maybe a few others. Those pans are easy to spot unless, possibly, they have been used a lot.
Steve