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 and North African 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