The rarest WMG silver mirror coin. Mirror coins of the 1927 vintage are true rarities among WMG coins, which are scarce even in the best collections. Very rare vintage, known single pieces. Excellent pieces, fine patina, impressive overall presentation. Slab at the bottom has an 8mm over-crack. A very rare coin, struck with a mirror stamp for the Free City of Danzig, in a very low mintage for collecting purposes. Parchimowicz specialty catalog 2012 edition - 65b, Kopicki 7848 - R8. WMG LUSTRZANKI are equivalent, low mintage collector coins of the Second Republic - erroneously associated with technological trials and cataloged as such by the authors of the studies. Coins such as the 10 zloty 1934 Pilsudski clipper, the 10 zloty 1934 Klamry, the 10 zloty Sobieski and Traugutt mirror-stamped coins, the 100 zloty 1925 Copernicus, or other such coins minted with the inscription SAMPLE in mintages of 20, 50 or 100, are COLLECTION MONETS !!!! Those minted with the mirror stamp, most often did not have the inscription SAMPLE. On those minted with the regular stamp, the inscription rehearsal was placed to distinguish them from circulation coins. All the mentioned coins of the Second Republic - are collector coins and this is confirmed in the interwar literature. This fact is also confirmed by the offer letters of the interwar mint store. Today, the collector coins of the Second Republic (called SAMPLES) cost a dozen - tens of thousands of PLN. WMG coins minted with the mirror stamp are exactly the same collector coins. Also minted in negligible mintages, appearing just as rarely in the trade. The authors of catalogs, for unknown reasons, omit them from the popular annual editions of catalogs, as if they did not exist at all, they were cataloged by J. Parchimowicz in a specialized catalog (2012 edition) - but without creating a separate section for them - as is the case with collector coins of the Second Republic, they were also described by Kopicki giving them a rarity between R7 and R8. PIECES FOR THE BEST WMG COIN COLLECTIONS.