Green’s Dictionary of Slang

Attleborough adj.

[? the town of its manufacture]

(US) an epithet used to describe cheap or sham jewellery; also used fig. (see cit. 1886).

[US]Matsell Vocabulum 9: attleborough, Not genuine; made to imitate. At the town of Attleborough jewelry is manufactured from the baser metals, or so alloyed as to deceive those who are not judges of the genuine article.
[US]‘Aguecheek’ [C. Fairbanks] Travels 329: Needy wantonness displaying its rouge and Attleborough jewelry all the more boldly because it feels that the ban of society is upon it!
T. Parker Lessons from the World of Matter 100: Poor Attleborough jewels are all these, but the best that humanity could offer.
[UK]Barrère & Leland Dict. of Sl., Jargon and Cant.
[UK]Farmer & Henley Sl. and Its Analogues.