Only if looking at an original photo and that does not hold true 100% of the time. Very few Wacos are restored with the correct striping today. Same goes with cowls and wheelpants. Many are flying with Cessna UC-78 cowls, fibreglass wheelpants that are more Howard-like then Waco, etc.
Another way to tell the year made is by the N number. For instance, 11 is 1931 (ex. 11253), 12 is 1932 (ex. 12457), 13 is 1933 (ex. 13066), etc. However, there are a few in there that do not follow the pattern (mine is a good example; NC14620 is 1935). This numbering series only held true from 1931-1939...however, there were no 18 series N numbers for 1938. Late 1929-1930 were generally 3-digit followed by N, K, Y, V (ex. NC663Y). However, you need to know whether it is a ASO/BSO/CSO/DSO/HSO/PSO/QSO based on the specific engine. If it is not a Straightwing, then it has to be an RNF/INF/KNF/MNF/ENF. Easiest way to tell is the angled ailerons and the tailwheel that is about two foot forward of the tailpost. If the number is just four digits then it is most likely a 1927-1929 model (ex. NC8558). If it has 3-digits and ends in H or E then it is a 1929 model (ex: NC719E). The UPF-7 series used 209 (NC20979), 293 (NC29303), 299 (NC29998), 301 (NC30122), 320 (NC32065), 321 (NC32158), 397 (NC39753) numbers. If it is a 1941 Standard Cabin then it used 316 (NC31663). See how confusing??????
By the way, there are a number of T-6/SNJ that are flying with original Waco CAA-assigned N numbers!
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