Thanks Carl for your ongoing feedback.To answer your q uestionI do not think it is a 1948 frame but I have come to realize anything is possible when working on these beautiful old machines. I did find another bolter who took pictures of his shackles alongside a square ruler so I will do the same put the square up and see if they are bolted at the same height.
Until then here are pictures I have on my phone with my shackles and the other pictures (rusty looking ) are the other persons pictures
