Dating Whiting Hackle

Hi there everyone,

I have some various saddle hackle pieces (full, half) and the reference on the back of the package refers to the number of flies that can be tied with each saddle pelt.

One of my saddles says (number 5. on the back of the hackle cardboard) that you can expect a bronze saddle to tie a minimun of 500 flies, and an older one says a bronze will tie a minimun of 250 flies.

I am just wondering when the change on the back occurred, so I could date the older saddle. Also, were there other changes to the Whiting packing that could help me date my various hackle pieces?

Thanks so much.

Philip