I have just checked my Cooke IIA 10 1/2 inch f/3.5 lens. It has the same PATENT No. 155640 engraved on its barrel, but has its No. 106447 engraved on the ring of the lens shade in the front with COOKE PORTRAIT LENS f/3.5 10 1/2 inch Series II.A. It was made between 1919 and 1925.
This 12 1/2 inch lens does not have any words engraved on the ring of lens shade in the front. All other things are identical with TAYLOR TAYLOR & HOBSON Ltd on the barrel.
In Cooke's IIA 1913 catalogue this lens was listed as a 12 inch lens and in its 1921 catalogue it became a 12 1/2 inch lens. So the series # 38247 penciled inside the lens barrel indicates it was made between 1915 and 1918.
http://camera-wiki.org/wiki/Taylor-H...serial_numbers
https://cookeoptics.com/t/compendium.html
The eBay seller had it listed as a 305mm lens while 12 1/2 inch is closer to 318mm.
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