Help ID Great Britain 3d, Graphite Lines

On the back, it is identified as Scott 358c, which makes sense because of the watermark and graphite lines. However, the watermark is inverted. I don't have another example to check, but my Stanley Gibbons says that this is SG 592, and that only the 1/2 and 1 1/2 were printed regularly with watermark inverted. Can anyone confirm that the Scott 358C (SG 592) has the normal watermark?





Maybe I'm looking in the wrong place in Stanley Gibbons? Thanks.

SG 592wi comes from booklets and it is normal to have half the booklets having upright and half inverted watermarks due to the printing process. I don't think Scott has a separate listing as far as I can see.

edit to paste link to SG/Scott numbers for this stamp.
http://www.stampsforsale.co.uk/qe2/....asp?cat=450

Yes, SG592 has the normal Wmk,

Wmk Inverted is SG592Wi (4th Aug 1959)


In a similar vein, Queen Elizabeth behind bars........ (Training Stamps)

Thanks for the replies. SG 592wi it is.