1939-1940 San Francisco World's Fair Chinese Souvenir Token Good Luck Token

Description

The following description for this token was taken from an online post requesting help in identifying it and any possible history about it.
“This is a sort of Chinese good luck token— often called a charm, amulet, or talisman. The characters appear to read Ch'ien-lung T'ung-pao— "circulating coin [or 'current treasure'] of Emperor Ch'ien-lung". Genuine Chinese cash coins of that period date c. 1735-96. However, this one differs from them in that the hole is triangular rather than square; also, it is struck rather than cast as the 18th century coins were. The symbols on the reverse are evidently occult/amuletic.
By the way, there are some collectors who believe this piece is a souvenir item from the Golden Gate International Exposition (world's fair) held in San Francisco in 1939-40, but I have no idea whether that's the case.”
This was the best possible information that I could find about this token so take it for just that, an opinion.
Condition is "Used". Shipped with USPS First Class.