THe original caption read: "Garage work at 1962 Dutch Grand Prix". The drivers and cars that raced that year:
No Driver Constructor
17 United Kingdom Graham Hill BRM
5 United Kingdom Trevor Taylor Lotus-Climax
1 United States Phil Hill Ferrari
2 Italy Giancarlo Baghetti Ferrari
7 South Africa Tony Maggs Cooper-Climax
14 Netherlands Carel Godin de Beaufort Porsche
11 Sweden Jo Bonnier Porsche
21 United Kingdom Jackie Lewis Cooper-Climax
4 United Kingdom Jim Clark Lotus-Climax
3 Mexico Ricardo Rodríguez Ferrari
18 United States Richie Ginther BRM
9 United Kingdom Innes Ireland Lotus-Climax
10 United States Masten Gregory Lotus-Climax
16 Germany Wolfgang Seidel Emeryson-Climax
12 United States Dan Gurney Porsche
6 New Zealand Bruce McLaren Cooper-Climax
20 United Kingdom Roy Salvadori Lola-Climax
19 United Kingdom John Surtees Lola-Climax
8 Australia Jack Brabham Lotus-Climax
15 Netherlands Ben Pon Porsche
16 Netherlands Rob Slotemaker Porsche
21 France Maurice Trintignant Lotus-Climax
Here's another pic of the same garage area. The mystery car car is now in the background, but is somewhat more visible. I'm pretty sure it has a Coventry-Climax engine.