I have a c.1963 Middlemore saddle on my 1963 Claud Butler Electron Super
Five. I have been told that Middlemore was a good, but economical seat.
Mine has held up stupendously through 50 years of riding. I don't see a
model number on it, but it has four gromets in the rear, two holding a
metal label saying "Middlemore/ Made in England" and it has three holes
down the center. There is a bit of design along the front edges. There are
metal cut outs to attach a saddle bag to. I have a digital picture of it
if that helps.
C.J. Scheiner
NY, NY, USA