Hi james , Your guess of 13 Brums for 1963 may not be too far out. I have found only two 1963 bikes for my register. S 1318, reg no. 652 PG, and S 1319, reg no. VYJ 141. They are the only two bikes I know of between S 1303 (1962 registered) and S 1325 (1964 registered). This leaves a gap of about 20 missing bikes,but whether or not they all were built is not known, and the family who know arn”t saying!!
