UPDATE – The answer is indeed Tim Chen, BV2A.
Another shoebox find courtesy Jose, EA5BCQ. The operator in the picture lived to 92 years of age. In actual fact he was more famous than he realised – for many years he was the only active radio ham from his country. Back in the day he used a Heathkit HW-100 and two crystals (one for CW, one for SSB) – he could only use two bands as per the licensing regulation then.
Who do you think is the mystery op?
PS: We’re running out of shoebox finds – can you help?.