Dan, I suspect that the peak production of all Pacemaker Graphic cameras was around that 1947-1950 period. Production would have declined as high quality German cameras became more readily available, most likely affection the small models earlier.
I know from articles by HS Newcombe (an author & photographic dealer) that there was a serious shortage of new camers in the UK after WWI until the early 1950's.
There must have been similar shortages in the US because some camera manufacturers (Ansco for instance) had to switch to making optical instruments for the US military. Graflex on the other hand had been supplying cameras to the military so in a better position to fill demand.