Cerjak, this helmet seems to be not a burgeonnette but a close helmet base on the location of the single holes on either side for visor hinge rivets. Burgeonnettes usually have pairs of holes set close to the browline at the point where it breaks a 90 degree angle about the middle of the ear. This thread demonstartes the usual location of the holes for hinge rivets for burgeonnettes
http://www.vikingsword.com/vb/showthread.php?t=16224 and this thread shows and example of the typical location for the visor rivets for close helmets
http://www.vikingsword.com/vb/showthread.php?t=16455 . Attached is a pic of a Maximillian close helmet I used to own that shows the location of the single holes on either side for the visor as well. This helmet also demonstrates a construction method that was not uncommon at the time but that I haven't gotten to see first hand much. The bowl is made in two halves, but rather than being simply crimped together along the comb ( this thread has an example of this construction method
http://www.vikingsword.com/vb/showthread.php?t=16171 ) and lap riveted at the front and back of the helmet bowl, this helmet has been forge welded together along the comb and lap riveted at the browline at the front and back of the helmet bowl. I don't get to see this method of construction ( an expidiency between the helmet bowl hot raised from a single piece of steel or iron and the two piece helemt bowl od riveted and crimped construction )much.