Yes, that's first generation Shimano 105, a.k.a. Golden Arrow. The embossing is actually a bow and arrow, as opposed to a trident. I haven't seen that serial number format before, so it doesn't appear to have been contract manufactured by one of the major names. However, based on what I know about Asian formats, it should be either a 1983 or 1984 model, which fits perfectly with the components and my original estimate. Given the era, components and tubeset, it would have been a lower mid-range bicycle. Sorry, that's all I can supply.