What does the LB stand for on a 1935 LB Switzerland Gold 20 Francs?

What does the LB stand for on 1935 LB Switzerland Gold 20 Francs?

 

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It means the 1935L-B issue was struck in 1945, 1946, and 1947.

 

It has the highest mintage too 20,008,813

 

Interesting.. Only the 1935 Later Date has the LB
https://en.numista.com/catalogue/pieces7497.html

I guess what @spirityoda stated

 

The "L" indicating "lingot" or bullion and the "B" indicating the Bern mint

 

Interesting.. But why only the 1935 later date coin?

 

In 1935, 175,000 regular strikes of the 20 franc coins were produced. However, an additional twenty million (20,008,813) coins dated "L1935B" with the "L" indicating "lingot" or bullion and the "B" indicating the Bern mint, were re-struck in 1945 (3,500,000), 1946 (7,108,813) and 1947 (9,400,000). An additional 9,200,000 coins contemporaneously struck and dated in 1947 were also produced and are distinguished by the mint mark "B". There were no regular strikes produced in the years 1945 and 1946

 

@daveydempsey great information.. Thanks!