2014-08-24

the SIS and OS vars ...

in past weeks, I have shown many iridescent shifts on the 1st and 2nd class machins 2009-2014.    earlier and continuing forms - SIS and OS, are also a collecting mode of discovery .

douglas myall developed the SIS ( S1, S2, S16 ... S17) system for describing the phosphor band varieties ... OS or offsets being another group ( CBOL, CBOR ...)

robin harris charts these here ...

collectors and dealers are featuring more of these as found ... so catalogists have a lot of revisions ahead in time ...

note: the harris album pages show only regular or normal phophors ... the SIS , OS , EOFs (errors-oddities-freaks) and no phosphors are excluded ...  why I use StampCat to generate these pages ...

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