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Someone seems to have bought the 1906 florin at £942 (status has changed to "awaiting stock"). Same for this 1904 at a mere £775.

In terms of hammered coins, I think Timothy Cook has put together one of the best lists I have seen, many of which are BTNA members - not to mention that he has hyperlinked them all such that you can just go down the list at your leisure and click to each shop/auction house. As you can imagine, there are also many other pre-decimal coins and even decimal coins at many of the websites. Most of the links are for fixed-price shops, but there are also the major auction houses sprinkled in throughout the list. Specifically, (like @TomGoodheart mentioned) he has called out helpful websites like NumisBids that act as platforms for viewing lots from multiple auction houses at once (not to mention you can also sometimes submit bids through NumisBids). https://www.englishhammered.com/links.html

MARSHALL COLLECTION Sold at Spink March 2004. Cream tickets, 48mm diameter. The ticket illustrated came with the Commonwealth halfpenny from the sale. The description on the other side clearly refers to a different coin, so the conclusion is that tickets were reused on occasion.

Mrs E M H NORWEB No tickets as all coins were kept in 2"x2" envelopes. The BNJ article says that they were either white of blue, but salmon pink was also used. It may be that colour coding applied to different types of coin as the pink one was a token and the white one a medieval hammered coin.