Hello Raul,

Welcome to the forum.

Is that you playing the banjo in the video?

The individual photos are generating an error message.

The video is too rapid and lo-res to tell much of anything so all we have to go on is the one photo cb400bill helped with.

The frame looks to be an asian production one from the early to mid 1970's, a one up from the bottom sort of model.

The Italian threaded shell is likely the result of a rethread due to damage. Another possibility is that it could have been manufactured by ACER-MEX as they used some Japanese frame building materials and some of their bikes came through with Italian threaded shells. One simple thing you could check is the shell width. Italian shells are 70mm, while nearly all asian ones are 68mm. Japan made some production bicycles with 70/71mm shells at one time.

Have no guesses as to who the manufacturer of the frame may have been.