Help to identify hand saws

Hi,
I recently purchased these three saws and have had no luck identifying them.
The longest one measures 515mm overall and has a brass split nut. The medallion says 'Trade Mark' and has a hammer and nail (?) logo.
The larger of the two keyhole saws measures 295mm overall. I'm pretty sure the split nuts are brass. There are no marks anywhere that I can see.
The other keyhole saw measures 290mm overall and has an antique telephone logo stamped into the blade.
Any info or help to identify and or date them would be greatly appreciated.