Really cool boots from I believe the 60's or 70's. See condition - they do have a LOT of leather wear on the outer surface. Please see all photos which really tell the story. Could use leather paint to fix a bit. I am estimating the size based on other shoes and how they fit me. I am a 9 and they are super tight so assume an 8 or maybe a 7.5. See dimensions below. Despite condition they are still made of a very good leather and have lots of miles left. 

Dimensions/approx: 
length toe to heel on sole: 10.5"
width ball of foot on sole: 3.5"
width bottom of heel: 3.5"
heel height: 1"
shaft bottom of heel to back top: 8.75"
shaft side bottom to top of highest point: 10.5"

Dont hesitate to ask if you have any questions or concerns!