You havent answered my question regards spencer internationally? genuinely interested as its a strange recoord. and wasnt juan joya the star of that penarol side?
On the second question, Joya was one of the most important members of the team but Spencer was the star of that team no questions asked. If a hypothetical ballon dor had to be picked from that team based on Intercontinental cup performances (like UCL now), it would be Spencer always.
On his international career, I tried looking into this long ago but there isn't enough information I could stumble on. Some sources say since he played in Uruguay outside of Ecuador, he didn't get too involved with the national team.
He also changed his national team back and forth almost half a dozen times between Ecuador and Uruguay and that probably didn't help
He finally got a chance and was offered to play in the 1970 WC for Uruguay but declined as he wanted to be loyal to Ecuador (he would have lost his Ecuadorian citizenship as well if he participated for Uruguay at that level if I am not wrong).
Complete unknown internationally, but for club, an absolute hero in a champion team. There is enough footage to not decide based on what I or anyone says though. His performance against the great Real Madrid team of 60's is the first game most people would point to if you are indeed interested,