I use pre-printed pages for my collection
I have a page for the 1944-45 air post stamps that were provisionally surcharged (C45-C50)
On the page I have space for C45 which is shown as having a "Violet surcharge" and for C48B also for "Violet surcharge"
In the basic Scott catalogue C45 is shown as V+bk which I assume means overprinted in Violet and in Black - although I've yet to come across a Violet surcharge
For C48B the surcharge is shown as only Bk
Does anyone have any more information on these 2 or is it an error on the pre-printed page?