These bars have the fairly-rare GB stem with recessed allen bolt. Its one of the only stems of this type I've seen in on 'the bay in the past 2-3 years.
The stem length appears to be for a 22.5" or 21.5" bike. This stem is a necessary part of a restoration for a Raleigh International bicycle, 1973-1976, the only model in the Raleigh line that came with these bars as standard equipment. I have also seen instances of the Raleigh Professional that looked original, and used this stem.
- Don Gillies
San Diego, CA