The tiny stamping on the cantle plate of my Professional says "A 77" which would be reasonable timing for the saddle to have been manufactured in 1977, since it was purchased new by a friend in 1979 at our local, low volume LBS.
Just wanted to add that data point.
The leather is branded underneath QBR and off to the side of that, there is a 2 and what looks like a partially branded H.
The frame on a re-skinned vintage B17 I have doesn't seem to have any stampings anywhere, apart from "Made In England."
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● 1971 Grandis SL ● 1972 Lambert Grand Prix frankenbike ● 1972 Raleigh Super Course fixie ● 1973 Nishiki Semi-Pro ● 1979 Motobecane Grand Jubile ●1980 Apollo "Legnano" ● 1984 Peugeot Vagabond ● 1985 Shogun Prairie Breaker ● 1986 Merckx Super Corsa ● 1987 Schwinn Tempo ● 1988 Schwinn Voyageur ● 1989 Bottechia Team ADR replica ● 1990 Cannondale ST600 ● 1993 Technium RT600 ● 1996 Kona Lava Dome ●