I recently got a royal enfield motorcycle with engine serial number j's13605 can anyone tell me what year it is?

Probably a late '40's model J, but the only folk that can posititively ID an Enfield are the REOC folk in the UK. No other records exist, I'm afraid. Towards the end of 1950 the numbers were in the 17000 range, but with Enfields nothing is simple!