yes, believe that date is correct.

I have one as well - it seems to be just a small dish about 6.5" long, although for what it was intended I've no idea. The Board of Trade Registration No. is 117501, and always worth quoting this, assuming you have access to those details. In which book did you check this Rd. No?
As so often happens, it look like Greener were Registering the decorative design - which appears to be the saw-tooth rim plus, in descending order, the mitres and finally the ovals - but not the base decoration of hobnails.
How many overall different pieces this design was used on I've no idea, but I've attached another picture showing a larger dish/bowl (nearly 11" long) on which the diamond has identical details - and although as usual the diamond is in relief on the glass, you can see it's in mirror image.
You'll also see from the attached Archives picture that the original Registration shows the larger dish/bowl, and not the smaller example you have.