Mappin & Webb silverplate dates

[dancula]

These markings are on a silverplate letter opener, in Art Nouveau style. Can anyone identify the year for date letter "C"?
I am a bit confused by the letters in 1920s-1930s.

Thanks

[dognose]

Hi,

To my knowledge, the dating system used by Mappin & Webb is yet to be cracked. It is complicated due to apparently different codes being used for 'Mappin Plate' and 'Prince's Plate'.

We do have a topic researching this question, to be found here: https://www.925-1000.com/forum/viewtopic.php?t=24149

Trev.

[dancula]

Thank you! I'll check that out..