515E = model 515, E = equipped with a Holmes Hi-Speed Towing cradle. TF7- T = Traffic King (There was also a Holmes Road King Serial no.'s 100-318) F = June, 7 = 1947. 2335 = unit no. 2335. The first Holmes 515 Traffic King was serial no. TAO-319 delivered Jan. 2, 1940. The last was serial no. TH3- 6378 delivered Aug. 13, 1953. Be sure to check out Chris's Wrecker in "The Gallery". It's "AWESOME" !