That's a 1986 model, the first year for the Triathlon and the only year it was offered with Super Vitus. Later versions used Reynolds 501 tubing. Now someone may try to tell you that it's a 1985 based on the serial number, B5155610. The first numeral indicates the year of manufacture. In this case it's 1985, but probably late 1985, when they were building up the inventory for the 1986 season. The hubs should have a four digit date code to corroborate the era.

PSN10 is the model number, with S indicating Super Vitus (early models used SV but weren't know as the Triathlon), N indicating clincher tires and the 10 indicating a racing series. Not sure what the T represents, but 52 should be the frame size in centimeters. Not sure about the other seven digit number either. From your list, all the components appear to be original. FYI, original cost was $500 US.