A bit of anecdotal stuff. The very first two civilian B205 went into service at Rumbai/Duri in May 1968. They started life as N4022G and 4023G, -22 then became VR-BCN and eventually PK-HBB and -23 became VR-BCO and PK-HBA, due to Vietnam being in full swing they were delivered with the 204 engine! Sadly one of them crashed in 1969 and took Dave Barnes, Harry Luffman and one other with it. I think they were both fitted with mirrors but probably not the vibration free variety?
My memory is a bit sketchy as I was on the B206A working with Delta Exploration, the seismic company and had the doubtful honour of the first of Bristow's Indonesian 206A engine failures! (PK-HBC).