MANUFACTURER:
Manufactured by Conway Stewart for the US pen company Esterbrook.
MODEL DETAILS:
The Relief 12 model is based on the Conway Stewart 28 pen of the 1950's, and was available in limited numbers in the same range of colours.
The difference between the 12 and 28 is that the former carried an 14ct Esterbrook Relief nib (that is Oblique) and the clip and lever carried an "R" logo (often found missing and replaced with a "CS" from the 28)
This is a decent example that is totally original, clean and shows little evidence of previous use.
The nib is reasonably smooth, is quite firm, and writes on the angle. See writing sample.
The photos are a good reflection of the pen, but if anything needs clarity then please ask.
ADDITIONAL PICTURES:
These can always be emailed on request - just ask for what is required.