Group,
    The gondola in question is indeed a post USRA, a clone that was built by Bethlehem in 1925, class GMl.  This was in a batch from 21500-21599, costing new $2282.45.  This had a lengthy career, being reported wrecked in May 1956.  One last bit, the brake detailing did not follow the USRA practice.

Bill Dale
In the heart of Reading coal country.