>Body length 51mm
Reason I asked whether 13.9 mm. was "piston o.d. (outside diameter) or cylinder i.d. (inside diameter)" was, if it was piston o.d., I wondered whether that might be a 15 mm. master cylinder, I'd read about an Italian-make one recently and I'd look it up.
>Says "Grimeca master " in the original post ?
My excuse is I was looking at the photo. and that bit of the post was off the bottom of the screen ...