I think it is BBWo 347 also called GN 11.09.9.02.
The diameter is 10 arc minutes according to Guide8, but looks like 4' in the image below.
BBWo is Brand, J., Blitz, L., & Wouterloot, J. G. A. 1986, A&AS, 65, 537
and GN is Neckel, T., & Vehrenberg, H. 1985, 1987, 1990, Atlas of Galactic Nebulae, Vol I-III (Treugesell Verlag, Düsseldorf)
The BBWo catalogue is at
http://cdsads.u-strasbg.fr/full/1986A%26AS...65..537B
The 5'x5' image below is from the DSS-2-red at:
http://archive.eso.org/dss/dss