Mexico Sterling ZIPPO Case Signed R.S.S. Eagle mark #56

[junk250]

I've got this slim Zippo lighter case marked Mexico sterling and the signiture of R.S.S. in a circle and the eagle mark with what looks like 56 in center(It's tiny and faint).

The lighter itself dates to 1963,so I assume case is from same era.

I can't find any reference to the R.S.S. signiture mark or the 56 eagle mark.

Thank's for any info you can provide.