Thanks again for all your responses. They really help! Here are mine to each of yours:
Chad, I don't know if it's 625 line standard. But I'm sure it's not from Britain as an attached label states the company is from Japan.
ita, you seem to be quite knowledgeable. I'm glad to know it should be made in the mid-70s.
Sandy G, "70s-disco-era look"! I have the same feeling too!
kc8adu, I'm from Macau, China. Surprised?
I'm not sure about it's general market price. Any ideas?