Broadway Flip Sundae

Pete's Place is on 256 Third Avenue, at East 21st Street. On the wall is an old-time menu (I was told it's from the 1920s) of a former store at the same location called the Gramercy Sweet Shop:

BANANA ROYAL...30
BANANA SPLIT...25
ANOLA (? - ed.) SUNDAE...20
NABISCO SUNDAE...20
CHOCOLATE SPRINKLE SUNDAE...20
CHOP SUEY SUNDAE...20
PINEAPPLE TEMPTATION...20
BROADWAY FLIP...20
ICE CREAM SODAS
ALL FLAVORS...10
FRENCH ICE CREAM SODA...15

What is a "Broadway flip"? See the 1965 article below, but the prices there are 40 cents a serving!

21 June 1965, New York Times, "Real Ice Cream Parlor Is Still Thriving in City" by Craid Claiborne, pg. 24:
"Those doors" are the entrance to the Becker and Citarella confectionery at 548 West 207th Street. To pass beneath them is to be transported to an ice cream parlor from the early years of the century.
(...)
In the room to the rear are marble-topped tables and a notice on the wall of the frozen specialties of the house. These include Broadway Flip, Lover's Delight, Pineapple Temptation and Marshmallow Sundae, and the cost is about 40 cents a serving.

"As far as I know," Chris Becker, one of the owners, said, "this ice cream parlor has been here since the building was built and that was in 1913 or 1914. I first came here when it was called Broger and Lewessen. They owned a lot of ice cream parlors in Manhattan."

6 February 1923, Hammond (IN) Times, pg. 7, col. 8 ad:
Savery's Candy Shoppe
BROADWAY
FLIP
SUNDAE
20c

5 November 1937, Hammond (IN) Times, pg. 28:
Quick Chocolate Sauce
(...)
Serve over ice cream with salted nuts or use to flavor Broadway Flip or chocolate ice cream sodas.