Guernsey Bisected Stamps

Towards the end of 1940 the Guernsey Post Office authorised the usage of bisected 2d stamps to use as 1d postage, however the usage by collectors only made the situation worse.
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1938 2d, commercial usage. £15.00 $22.50	1940 2d Centanary, commercially usage, 20th Feb 1941, (split 0 slug) £12.00 $18.50
1940 2d Centenary, philatelic use on post card, £10.00 $15.50	1940 Centenary Multiple usage, philatelic, but really quite unusual. £20.00 $29.50