Pappy’s #1741)? At the end of that story he is asked to make gold, and in this story he does! He even sells $10,000,000 of it to the U.S. Government! What a pal!
Dr Synthe takes his powers from space itself, where he can gather particles of celestial matter and form objects, including body parts (see the aforementioned first story). For people needing organ transplants he would be a handy guy to have around, but then, as now, no individual lives mattered as much as gold. With it Dr Synthe and his friends can buy their own apartment building. What a fantasy that must have been for New York apartment dwellers of the time.
As usual, all that glitters, etc... Making gold just brings down more troubles, in this case a foreign power trying to kidnap him. In this episode Dr Synthe shows another power of his, the ability to grow tall, like the villain, the Claw, and another superhero of the era, Phantasmo. I scanned an entire book of black line Phantasmo reprints in 2012. Just check the link below.
This story is from Stars and Stripes Comics #4 (1941).
As promised, here is Phantasmo: