This question has been up on this Forum a couple of years before.
Even though the Bean handcuffs (including Iver Johnson and Lovell handcuffs) were kind of mass produced
it seems like the weights differ from specimen to specimen. The Bean cuffs were manufactured in three
models; Detective, Patrolman and Prison. To make it a little more complicated, each model also came
in different variations. For instance; the Bean Prison cuff came with both standard and heavy hinge and standard and heavy
link. Fellow collector Gordon Gluff has written a very interesting article about Bean handcuffs for the 2006 Handcuff Annual and I strongly recommend you to buy the book. http://www.cannonsgreatescapes.com/books&videos.html
A table of weights for different Bean variations.
Comparison between Bean Detective, Patrolman and Prison
A selection of Bean, Lovell and Iver Johnson handcuffs