The Dutch Series #5 - Piccolo's in the PTT

I have posted a piece about the beret in the postal service before (all French postal service berets) and unknown to me that the Dutch PTT actually used berets as well, between 1949 and 1963. 

The 'Piccolo's'  were the telegram delivery boys of the PTT, wearing a beret with the stylized letters PTT for a chrome beret badge on a fake-leather red background.

The design of the badge is by Nicolaas de Koo (1981 - 1960).