Question re: "The China Tiffin Club of San Francisco and Bay Area"

I love to run into these kinds of puzzles, but this one has me stumped. I came across a letter written by John H. Falge from The China Tiffin Club of San Francisco and Bay Area, thanking George Kerr for speaking at the Club on Feb. 23, 1950. (A funny part of his praise of the talk: "The points you developed stood out prominently because the talk was just the right length.") 

I'm guessing that Falge is the same person buried at Arlington National Cemetery.  He was evidently in the Navy during WWI, according to these documents that mention him. (In fact, here's a picture of him and his fellow officers of the USS. Wadsworth.) 

Anyway, my point is not so much to find out more about Commander Falge as it is to find out about the China Tiffin Club of San Francisco and Bay Area. Right now Google gives me only one result for "China Tiffin Club of San Francisco," and it's for a 1954-1955 membership directory. To quote the description (in case this page disappears):

From inside front cover: "A purely social Tiffin Club where former residents of the Orient meet to renew old friendships, made 'somewhere east of Suez' and cherished forever."Contains: List of officers Introduction Members List of guest speakers 1952-1955 Constitution and by-laws List of other similar clubsFrom a meeting announcement in the 1/22/1959 Daily Independent Journal newspaper, San Rafael, CA:"Members of the club are 'old China hands,' who meet each month to renew old friendships, eat Chinese food and hear informal talks on the Orient..."

My question is, what is a Tiffin Club (purely social or otherwise)? 

[Update, 11/8/23: Well, to answer my own question, when I looked up "Tiffin" on Wikipedia, I found out that it's a kind of small mid-afternoon meal or snack, kind of like British teatime. the article says this about the etymology of the term:

In the British Raj, tiffin was used to denote the British custom of afternoon tea that had been supplanted by the Indian practice of having a light meal at that hour.^[4] It is derived from "tiffing", an English colloquial term meaning to take a little drink. By 1867 it had become naturalised among Anglo-Indians in northern British India to mean luncheon.^[5]

So my guess is that the China Tiffin Club is/was a kind of a lunch club whose members were "former residents of the Orient," as mentioned above. Question answered!]