From my experience, I've not seen a flat colour enamel style dial on these 60s / 70s vintage GP alarms, but that doesn't mean they didn't originally exist. The sunburst dials - silver or gold - are more ubiquitous. However the "GP" and "Alarm" lettering look original in font / design. If you really like and want this one suggest asking the seller to guarantee its not a redial - then if by chance it turns out it is then you have recourse.
The second ones dial is more normally what's seen (and the blue alarm numbering is a nice addition), but as you already observe the crowns are not original. One should be stamped "A" for Alarm and neither should be domed.
These GPs are not particularly rare and if you're not entirely comfortable with provenance or dial colour etc I'm sure they'll be other offerings along soon. A little patience gives rewards in the vintage arena, and the search has been part of the appeal for me.
Good luck
Ps: My GP Alarm is the later 70's model.


