Green’s Dictionary of Slang

ridge n.

[the term vanished in the UK during the 19C but reappeared in Aus. in the mid-20C+]

1. [late 17C–mid-19C; 1920s+] (also rige) gold, thus money, a guinea.

2. [mid-19C+] (UK/US Und.) coins, rather than notes.

In compounds

ridge cove (n.) [cove n. (1)]

[late 18C–mid-19C] (UK Und.) a goldsmith.

ridge cully (n.) [cully n.1 (5)]

[mid-17C–early 19C] (UK Und.) a goldsmith.

ridge montra (n.) [montra n.]

[19C] (UK Und.) a gold watch.

ridge-super (n.) [super n.2 (1)]

[mid-19C] (UK Und.) a gold watch.

ridge thimble (n.)

[mid-19C] (UK Und.) a gold watch.