Maybe it is just catalog blindness but I am having a hard time finding this one in the Stanley Gibbons catalog. It is watermark 6a, perf 14, scarlet and perf 14. It also seems to be on very thin crisp paper.
I found your stamp in the Stanley Gibbons ,Commonwealth & Brittish Empire Stamp catalogue (1840-1952) , my catalogue is from 2007
catalog number : 84: 1 1/2d Scarlet (issued on 14 august 1924) watermark 6a and printed by Harrison it's catalogue price in my 2007 edition catalogue is 13 mint and 9.50 cancelled (prices in Pounds)
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