Yes, I believe it is a PD type carb possibly a 12H3 or H4. I have seen these butterflies fitted to those carbs. That is, the butterflies are not brass like the PD12K6 (Allison engines) but instead are a type of plastic (?) with cut outs and stainless shields. These carbs were fitted to C47 and Lodestar amongst other planes with radials. The thin stainless (what looks like) gaskets are what remains of the diaphragms. The flexible membrane was attached to these stainless "frames". Hope this helps?