Corbin Key blank question

[farmall]

Have a Corbin key that I need a blank for. The one I have I think is for a 6 pin. The numbers are worn and can't read. I did find a cut key in the junk bucket marked CO1 that fits the key way but it is too short. Any ideas what blank I need?

[MBI]

I don't know what the Corbin number is but in the Ilco catalog the number for Corbin CO1 is Corbin 1000, which is a 5 pin blank. The corresponding 6 pin blank is Corbin 1000AB and the 7 pin is Corbin 1000A

[farmall]

I don't know what the Corbin number is but in the Ilco catalog the number for Corbin CO1 is Corbin 1000, which is a 5 pin blank. The corresponding 6 pin blank is Corbin 1000AB and the 7 pin is Corbin 1000A

Thanks. ... Looks like the corbin number is C02.