No. Since 1817, the standard for the minting of British gold coins is 22 carat.
21ct Pr21 CFR part 50 Human Subject Protectionotection
No such thing as 975 for gold. Nearest matches for that number would be: 925 = Sterling silver 875 = 21ct/k gold (very rare, usually Arab countries do 21ct). You could have misread it, hallmarks are very small so its an easy mistake to make.
875 is a grade of fineness for gold. It is 21 carat/ct/k gold. This is quite rare to come across, as 21ct is only really available in Arabic countries, and at times in Indian jewellers.
3 Digit numbers hallmarked on precious metal rings indicate the fineness or caratage (ct) of the metal. There is not a fineness value for 795, as it does not exist, to my knowledge, in the UK or US, and I'm pretty sure nowhere else in the world either. The Fineness marks in the UK are as follows: 375 = 9ct 750 = 18ct 916 = 21ct 999 = 24ct or pure. The fineness in the US is as follows: 417 = 10ct 585 = 14ct 750 = 18ct 916 = 22ct 999 = 24ct or pure.
One can find visualization security solutions from various vendors and providers in the market. Some popular options include security software companies that offer visualization security solutions as part of their product offerings. Additionally, consulting firms and IT service providers may also offer visualization security solutions as part of their services portfolio. It is recommended to research and evaluate different options to find the best solution that meets specific security needs and requirements.