Hello
I would certainly recommend the three books by Pamela Caunt.
Assuming they are still readily available, they are very reasonably priced and do contain a lot of useful information. The sweethearts are all illustrated in colour and there is a descriptive text giving more details of each badge and of that category badge - ie hollow silver badges, mottoes, mother-of-pearl and so on.
There are some period adverts (always a nice touch) and a list of makers and their marks. About 48 pages in all and hundreds of items illustrated.
Provided you can pick them up at a reasonable price you can't go far wrong.
Hopefully some other member will be able to add to the book list!
Regards
Roger
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