Hi Yuri
The Davis Components factory located in Four Oaks, Midland in the UK made sandcasted bottom brackets shells for 80 years (since 1928) Many Dutch, Belgian and British builders used their BBs. Your 79-47 RIH is probably a Cové factory built RIH bike. Number 47 of building year 1979. I have a 79-125 RIH here in Canada. Mr. Non-Fixie and I still are not sure of the origine of the 79-*** frames by RIH. There are lots of them on this forum. Have fun rebuilding this bike and getting some matching components.