One of the best sources for pre-MoQ and pre-LPR boxing in England, which I place in the late period "Broughton Era" is Daniel Mendoza's "The Modern Art of Boxing." It contains descriptions, exposition, instruction, (very importantly) his "Six Lessons," and (a real treat) a description of his famous fight with Humphreys, another famous and influential boxer of the day (it was the equivalent of the Thrilla in Manila fo its day).
Based on this work, as well as others, we see that elbow blocks and the equivalent of "high blocks" were common and in use. The most interesting elbow block is described in Mendoza's First Lesson:
"Master strikes round at your right ear with his left.
Parry with your right arm, turning up the elbow so as to cover the side of the head..."
Lesson Two lists:
"Master strikes 1 at the side and 2 at the stomach.
Parry with the proper arms, first by catching the blow on the proper elbow, and secondly, parrying the blow at the stomach with the proper fore-arm; that is, if he strikes with his left first, catch it with your right elbow, and bar his right with your left across your stomach, and vice versa of his right."
Strikes at the face and head were also more than was once thought. The very first two techniques taught in Mendoza's first Lesson are defenses against a straight left and a straight rear at the face"
"Master strikes with his left arm at your face.
Parry with your right fore-arm, barring at the same time your stomach with your left fore-arm, throwing your head and body back.
Master strikes with his right at your face.
Parry with you left fore-arm, barring at the same time your stomach with your right fore-arm, throwing your head and body back."
In a truly fascinating snapshot of the Mendoza v. Humphreys match, the first three rounds read like the script to a Bruce Lee scene. Humphreys throws a punch at Mendoza's face, Mendoza counters with a single straight to Humphreys face, knocking him on his butt and ending the round:
"
Humphreys aimed the first blow at the face of his antagonist. This Mendoza stopped, returned it with great quickness, and knocked him down: the second and third rounds terminated exactly in the same manner."
Fists were protected from injury by using a pistol-grip punch, being specific about how they punched, and by conditioning the fists which included graduated striking routines and jow-like lineaments, tinctures, and decoctions. "Gloves," called "Mufflers" or "Mittens" at the time, were known but only used by amateurs or during practice in which the pro wanted to minimize injury. Many pros eschewed their use entirely, decrying them as unmanly. One of my favorite references is of a boxer from the book
Claret and Cross-Buttock:
"Some said he was an argument against the Ring: that he shouldn't be let loose against a fightin' sportsman. That he fought like wild beast. That he never knew when to lay off. He hated gloves. Why go to all the trouble to pickle your hands in Tom Sayer's brew of turps, whiskey vinegar, horse radish and saltpetre, if ye were goin' to cover them up? Ye were supposed to use your hands to hurt him, not protect him."
I'm not sure that this answered the question you were positing. Did I get close?
Peace favor your sword,
Kirk