Hi David,
Yes, it will be 65033 in nicely polished up condition as on May 7 1960. I chose 65033 as this was one of the few J21s that I could find photos of both sides on the same date. Pictures are so important, but like the lady Armstrong, the ones I really need don't turn up until everything is done! The other contender was 65099 but the Westinghouse brake lines were not clear on the photos I found on the web. 65033 had the 67A boiler in 1960 so hopefully I have modelled it correctly as the kit instructions were pathetic.
Look forward to seeing yours complete - it really looks good.
Steve