A postcard, postmarked 1955, revealed a segment of the mural, along with glimpse of a bar and table seating.
With more Internet searching, I learned that the original mural from Lingnan restaurant had been permanently installed in 2001 at Brooklyn Central Public Library. I also learned that the muralist, Dong Kingman (1911-2000), had had a long, very successful career in New York and California. His work is in many museums and private collections.
Kingman knew the owners of Lingnan and the friends made an arrangement that the painting would be paid for in exchange for $1000 in credit for meals at Lingnan. Accordingly, this Life Magazine article from May 14, 1951 shows the artist and his first wife, Janice, enjoying a meal in front of the painting.