1935-A $1 Silver Certificates split block printing; Blue Seal, Experimental, Hawaii, North Africa
The 1935-A $1 Silver Certificate printing is especially interesting because at times the BEP halted printing the standard blue seals and transitioned to others such as Experimentals, Hawaii brown seals and North African yellow seal notes.
A fun challenge is to try and collect them all!
The S-C block was printed with quite a few varieties, specifically these ranges
S00000001C - S39996000C Blue Seal
S39996001C - S54996000C Hawaii brown Seal
S54996001C - S70884000C Blue Seal
S70884001C - S72068000C Experimental Red R
S72068001C - S73884000C Blue Seal
S73884001C - S75068000C Experimental Red S
S75068001C - S99999999C Blue Seal