Came across this in another forum.
As there was no chassis info in the register and Boško Milenković's name was not posted here, I thought it might be of interest:

Boško Milenković The Bugatti T51 at Belgrade GP

from: http://translate.google.com/translate?depth=1&hl=en&ie=UTF8&prev=_t&rurl=translate.google.co.uk&sl=auto&tl=en&u=http://forum.b92.net/topic/58780-klasika/page-4

apparently this is him too

from http://staribeograd.weebly.com/trke-na-kalemegdanu.html

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found more pictures of the race:

from http://en.espnf1.com/f1/motorsport/story/15909.html
on the day of the race, the war was declared

left rear:


and added the info to the wiki, with added info from Leif Snellman' s magnificent site and Wikipedia

and appearance in film at 1:03 and 2:59 and 3:53
http://www.youtube.com/watch?v=F8nB7PSeyFo

here the car is in the second picture from left and part of the license plate can be read:


Now to identify the car ...
What happened to it in the war ? Did it survive ?

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