This appears to be the real thing; although, I may be wrong. This Real Photo Post Card (RPPC) depicts a night shot of the fire that devastated Bluff City Mills in July of 1946. The mill was partially rebuilt and finally gave up the ghost somewhere in the early 1990s.
I can’t find any references on the internet to Bluff City Photo Shop, but Frasher’s is well known in and around Pomona CA. The company went out of business circa 1955.
This card was purchased locally by a buddy of mine who has an eagle-sharp eye when it comes to local collectibles.