A presumably older  frame set, perhaps pre WW2?

Otero road bike #1417

This bike looks to be from the 1950s. Notice the unusual and possibly unique to Otero fork crown.

Special pista #1773
Reputed to have been ridden by Federico Bahamontes (El Aguila de Toledo)
among other riders, in six day events.

This ultra light bike has some unusual and artistic aspects: it appears to filet brazed using stainless steel, the haed tube has been relieved  revealing the fork steerer tube (painted red)
 

 An unpainted but more recent farme (1970s?)