watermark on Great Britain stamps #159-172 compared to #187-200

How does one tell if a stamp is from the Great Britain series 159-172 or the series 187-200? I have a number of stamps with watermark 33 and others watermark 35. But my Scott catalogue mentions watermark 35 only in the case of 188 and 189. Are stamps with the 35 watermark from the 1924 series 187-200?

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