Toby,
As always, thanks for sharing and discussing, especially explaing how the block safety works, you did it much better than I would have! ;-) I have a question for you...who else in Birmingham or elsewhere was producing Scott/Perkes back action style actions and barreled actions to the trade besides W&C Scott?

According to Baker....the block safety was patented in 1879 by J.V. Needham and G. Hinton. The assignation of patent (the number) was destroyed in the 1960's. No record exist of when Needham and Hinton sold this patent to Scotts either.

Dustin