^ Seatstay caps are similar to my Bob Jackson - lugs are slightly different, but the frame number looks to be a reasonable match.
Is the serial# on the BB?
Mine takes a 27.0 seatpost too - track bikes were often built of sterner stuff than their TT counterparts!!
More photos here - starting from pg 38 of this thread.
My frame number's 4854 from 1964
and Apolloxl has 4103 from 1960
On the RTTC forum there was a 1973 model at number 9359
Assuming they made roughly 500 per year it is worth investigating whether or not you have a ca. 1966/1967 Bob Jackson
^ Seatstay caps are similar to my Bob Jackson - lugs are slightly different, but the frame number looks to be a reasonable match.
Is the serial# on the BB?
Mine takes a 27.0 seatpost too - track bikes were often built of sterner stuff than their TT counterparts!!
More photos here - starting from pg 38 of this thread.
My frame number's 4854 from 1964
and Apolloxl has 4103 from 1960
On the RTTC forum there was a 1973 model at number 9359
Assuming they made roughly 500 per year it is worth investigating whether or not you have a ca. 1966/1967 Bob Jackson